linux-kernel - Re: [syzbot] memory leak in vfs_tmpfile

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Message-ID: <CAJfpegtyWgdZDxPoYgwE=LekX1bNi8x0+Odvh-KYthSVxZMx7Q@mail.gmail.com>
Date:   Thu, 13 Oct 2022 10:28:45 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     syzbot <syzbot+fd749a7ea127a84e0ffd@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, linux-unionfs@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] memory leak in vfs_tmpfile_open

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
master

On Thu, 13 Oct 2022 at 10:05, syzbot
<syzbot+fd749a7ea127a84e0ffd@...kaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    49da07006239 Merge tag 'memblock-v6.1-rc1' of git://git.ke..
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=12fea734880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=8a068149f16da5bd
> dashboard link: https://syzkaller.appspot.com/bug?extid=fd749a7ea127a84e0ffd
> compiler:       gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14dfc1a4880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=123af8aa880000
>
> Downloadable assets:
> disk image: https://storage.googleapis.com/syzbot-assets/827598b3022b/disk-49da0700.raw.xz
> vmlinux: https://storage.googleapis.com/syzbot-assets/a6e5b024841f/vmlinux-49da0700.xz
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+fd749a7ea127a84e0ffd@...kaller.appspotmail.com
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 23.770s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 23.770s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 23.760s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 23.760s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 25.050s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 25.050s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 25.040s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 25.040s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 26.330s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 26.330s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 26.320s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 26.320s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 27.580s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 27.580s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 27.570s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 27.570s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.460s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.460s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.450s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.450s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105a4b500 (size 256):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.490s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     a0 04 7d 07 81 88 ff ff 00 8f b0 0e 81 88 ff ff  ..}.............
>   backtrace:
>     [<ffffffff815dbadf>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff815dbadf>] __alloc_file+0x1f/0xf0 fs/file_table.c:138
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff8881024495a0 (size 24):
>   comm "syz-executor426", pid 3643, jiffies 4294961352 (age 31.490s)
>   hex dump (first 24 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00                          ........
>   backtrace:
>     [<ffffffff82222e7a>] kmem_cache_zalloc include/linux/slab.h:702 [inline]
>     [<ffffffff82222e7a>] lsm_file_alloc security/security.c:575 [inline]
>     [<ffffffff82222e7a>] security_file_alloc+0x2a/0xb0 security/security.c:1529
>     [<ffffffff815dbb1d>] __alloc_file+0x5d/0xf0 fs/file_table.c:143
>     [<ffffffff815dc6e9>] alloc_empty_file_noaccount+0x19/0x50 fs/file_table.c:209
>     [<ffffffff815efee6>] vfs_tmpfile_open+0x26/0x90 fs/namei.c:3644
>     [<ffffffff81bf7e0c>] ovl_do_tmpfile fs/overlayfs/overlayfs.h:317 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_tmpfile fs/overlayfs/copy_up.c:747 [inline]
>     [<ffffffff81bf7e0c>] ovl_do_copy_up fs/overlayfs/copy_up.c:839 [inline]
>     [<ffffffff81bf7e0c>] ovl_copy_up_one+0xe5c/0x1670 fs/overlayfs/copy_up.c:1007
>     [<ffffffff81bf8727>] ovl_copy_up_flags+0x107/0x170 fs/overlayfs/copy_up.c:1053
>     [<ffffffff81bf8890>] ovl_maybe_copy_up+0x100/0x130 fs/overlayfs/copy_up.c:1085
>     [<ffffffff81bedeb2>] ovl_open+0x52/0x100 fs/overlayfs/file.c:152
>     [<ffffffff815d009f>] do_dentry_open+0x2ff/0x7c0 fs/open.c:882
>     [<ffffffff815f68ef>] do_open fs/namei.c:3557 [inline]
>     [<ffffffff815f68ef>] path_openat+0x161f/0x1b70 fs/namei.c:3713
>     [<ffffffff815f96e1>] do_filp_open+0xc1/0x1b0 fs/namei.c:3740
>     [<ffffffff815d3a0d>] do_sys_openat2+0xed/0x260 fs/open.c:1310
>     [<ffffffff815d429d>] do_sys_open fs/open.c:1326 [inline]
>     [<ffffffff815d429d>] __do_sys_open fs/open.c:1334 [inline]
>     [<ffffffff815d429d>] __se_sys_open fs/open.c:1330 [inline]
>     [<ffffffff815d429d>] __x64_sys_open+0x7d/0xe0 fs/open.c:1330
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888105b4b900 (size 176):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.480s)
>   hex dump (first 32 bytes):
>     01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff81283347>] prepare_creds+0x27/0x470 kernel/cred.c:260
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> BUG: memory leak
> unreferenced object 0xffff888100c4bb80 (size 32):
>   comm "syz-executor426", pid 3645, jiffies 4294961353 (age 31.480s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 b0 12 bb 00 81 88 ff ff  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<ffffffff814ce961>] __do_kmalloc_node mm/slab_common.c:954 [inline]
>     [<ffffffff814ce961>] __kmalloc+0x41/0x130 mm/slab_common.c:968
>     [<ffffffff82223655>] kmalloc include/linux/slab.h:581 [inline]
>     [<ffffffff82223655>] kzalloc include/linux/slab.h:712 [inline]
>     [<ffffffff82223655>] lsm_cred_alloc security/security.c:540 [inline]
>     [<ffffffff82223655>] security_prepare_creds+0xa5/0xd0 security/security.c:1705
>     [<ffffffff81283606>] prepare_creds+0x2e6/0x470 kernel/cred.c:291
>     [<ffffffff81be20cd>] ovl_fill_super+0xad/0x2730 fs/overlayfs/super.c:2007
>     [<ffffffff815df27c>] mount_nodev+0x5c/0xc0 fs/super.c:1446
>     [<ffffffff8164321b>] legacy_get_tree+0x2b/0x90 fs/fs_context.c:610
>     [<ffffffff815dcd78>] vfs_get_tree+0x28/0x100 fs/super.c:1530
>     [<ffffffff81620c37>] do_new_mount fs/namespace.c:3040 [inline]
>     [<ffffffff81620c37>] path_mount+0xc37/0x10d0 fs/namespace.c:3370
>     [<ffffffff8162181e>] do_mount fs/namespace.c:3383 [inline]
>     [<ffffffff8162181e>] __do_sys_mount fs/namespace.c:3591 [inline]
>     [<ffffffff8162181e>] __se_sys_mount fs/namespace.c:3568 [inline]
>     [<ffffffff8162181e>] __x64_sys_mount+0x18e/0x1d0 fs/namespace.c:3568
>     [<ffffffff84600f65>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>     [<ffffffff84600f65>] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
>     [<ffffffff84800087>] entry_SYSCALL_64_after_hwframe+0x63/0xcd
>
> executing program
> executing program
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@...glegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches

View attachment "ovl-fix-tmpfile-leak.patch" of type "text/x-patch" (680 bytes)