linux-kernel - memory leak in iget

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Date:   Mon, 22 Feb 2021 01:06:14 -0800
From:   syzbot <syzbot+739e5b9d4646ff8618a9@...kaller.appspotmail.com>
To:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: memory leak in iget_locked

Hello,

syzbot found the following issue on:

HEAD commit:    f40ddce8 Linux 5.11
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11e1a434d00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5528e8db7fc481ae
dashboard link: https://syzkaller.appspot.com/bug?extid=739e5b9d4646ff8618a9
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10aeddd2d00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+739e5b9d4646ff8618a9@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810ffd32e0 (size 608):
  comm "systemd", pid 1, jiffies 4294966945 (age 26.710s)
  hex dump (first 32 bytes):
    80 80 0c 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
  backtrace:
    [<00000000159405a6>] alloc_inode+0xbe/0x100 fs/inode.c:235
    [<00000000a1ba61ba>] iget_locked+0x126/0x340 fs/inode.c:1192
    [<0000000058bf69d6>] kernfs_get_inode+0x20/0x190 fs/kernfs/inode.c:252
    [<0000000038d3c844>] kernfs_iop_lookup+0xa0/0xe0 fs/kernfs/dir.c:1100
    [<00000000f316b4af>] lookup_open fs/namei.c:3085 [inline]
    [<00000000f316b4af>] open_last_lookups fs/namei.c:3180 [inline]
    [<00000000f316b4af>] path_openat+0x95d/0x1b00 fs/namei.c:3368
    [<00000000952158a9>] do_filp_open+0xa0/0x190 fs/namei.c:3398
    [<00000000ca8d298d>] do_sys_openat2+0xed/0x230 fs/open.c:1172
    [<00000000be6807df>] do_sys_open fs/open.c:1188 [inline]
    [<00000000be6807df>] __do_sys_open fs/open.c:1196 [inline]
    [<00000000be6807df>] __se_sys_open fs/open.c:1192 [inline]
    [<00000000be6807df>] __x64_sys_open+0x7d/0xe0 fs/open.c:1192
    [<00000000ea2012e0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000e7253572>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff888111bd1ab0 (size 24):
  comm "systemd", pid 1, jiffies 4294966945 (age 26.710s)
  hex dump (first 24 bytes):
    18 34 fd 0f 81 88 ff ff 90 e3 09 82 ff ff ff ff  .4..............
    00 00 00 00 00 00 00 00                          ........
  backtrace:
    [<00000000c34be1ab>] kmem_cache_zalloc include/linux/slab.h:672 [inline]
    [<00000000c34be1ab>] lsm_inode_alloc security/security.c:590 [inline]
    [<00000000c34be1ab>] security_inode_alloc+0x2a/0xb0 security/security.c:973
    [<00000000682cda2f>] inode_init_always+0x10c/0x250 fs/inode.c:170
    [<00000000b63896fb>] alloc_inode+0x44/0x100 fs/inode.c:240
    [<00000000a1ba61ba>] iget_locked+0x126/0x340 fs/inode.c:1192
    [<0000000058bf69d6>] kernfs_get_inode+0x20/0x190 fs/kernfs/inode.c:252
    [<0000000038d3c844>] kernfs_iop_lookup+0xa0/0xe0 fs/kernfs/dir.c:1100
    [<00000000f316b4af>] lookup_open fs/namei.c:3085 [inline]
    [<00000000f316b4af>] open_last_lookups fs/namei.c:3180 [inline]
    [<00000000f316b4af>] path_openat+0x95d/0x1b00 fs/namei.c:3368
    [<00000000952158a9>] do_filp_open+0xa0/0x190 fs/namei.c:3398
    [<00000000ca8d298d>] do_sys_openat2+0xed/0x230 fs/open.c:1172
    [<00000000be6807df>] do_sys_open fs/open.c:1188 [inline]
    [<00000000be6807df>] __do_sys_open fs/open.c:1196 [inline]
    [<00000000be6807df>] __se_sys_open fs/open.c:1192 [inline]
    [<00000000be6807df>] __x64_sys_open+0x7d/0xe0 fs/open.c:1192
    [<00000000ea2012e0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000e7253572>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810ffd8ce0 (size 608):
  comm "systemd", pid 1, jiffies 4294966945 (age 26.710s)
  hex dump (first 32 bytes):
    a4 81 0c 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff  ................
  backtrace:
    [<00000000159405a6>] alloc_inode+0xbe/0x100 fs/inode.c:235
    [<00000000a1ba61ba>] iget_locked+0x126/0x340 fs/inode.c:1192
    [<0000000058bf69d6>] kernfs_get_inode+0x20/0x190 fs/kernfs/inode.c:252
    [<0000000038d3c844>] kernfs_iop_lookup+0xa0/0xe0 fs/kernfs/dir.c:1100
    [<00000000f316b4af>] lookup_open fs/namei.c:3085 [inline]
    [<00000000f316b4af>] open_last_lookups fs/namei.c:3180 [inline]
    [<00000000f316b4af>] path_openat+0x95d/0x1b00 fs/namei.c:3368
    [<00000000952158a9>] do_filp_open+0xa0/0x190 fs/namei.c:3398
    [<00000000ca8d298d>] do_sys_openat2+0xed/0x230 fs/open.c:1172
    [<00000000be6807df>] do_sys_open fs/open.c:1188 [inline]
    [<00000000be6807df>] __do_sys_open fs/open.c:1196 [inline]
    [<00000000be6807df>] __se_sys_open fs/open.c:1192 [inline]
    [<00000000be6807df>] __x64_sys_open+0x7d/0xe0 fs/open.c:1192
    [<00000000ea2012e0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000e7253572>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

BUG: memory leak
unreferenced object 0xffff88810ed17e28 (size 24):
  comm "systemd", pid 1, jiffies 4294966945 (age 26.710s)
  hex dump (first 24 bytes):
    18 8e fd 0f 81 88 ff ff 90 e3 09 82 ff ff ff ff  ................
    00 00 00 00 00 00 00 00                          ........
  backtrace:
    [<00000000c34be1ab>] kmem_cache_zalloc include/linux/slab.h:672 [inline]
    [<00000000c34be1ab>] lsm_inode_alloc security/security.c:590 [inline]
    [<00000000c34be1ab>] security_inode_alloc+0x2a/0xb0 security/security.c:973
    [<00000000682cda2f>] inode_init_always+0x10c/0x250 fs/inode.c:170
    [<00000000b63896fb>] alloc_inode+0x44/0x100 fs/inode.c:240
    [<00000000a1ba61ba>] iget_locked+0x126/0x340 fs/inode.c:1192
    [<0000000058bf69d6>] kernfs_get_inode+0x20/0x190 fs/kernfs/inode.c:252
    [<0000000038d3c844>] kernfs_iop_lookup+0xa0/0xe0 fs/kernfs/dir.c:1100
    [<00000000f316b4af>] lookup_open fs/namei.c:3085 [inline]
    [<00000000f316b4af>] open_last_lookups fs/namei.c:3180 [inline]
    [<00000000f316b4af>] path_openat+0x95d/0x1b00 fs/namei.c:3368
    [<00000000952158a9>] do_filp_open+0xa0/0x190 fs/namei.c:3398
    [<00000000ca8d298d>] do_sys_openat2+0xed/0x230 fs/open.c:1172
    [<00000000be6807df>] do_sys_open fs/open.c:1188 [inline]
    [<00000000be6807df>] __do_sys_open fs/open.c:1196 [inline]
    [<00000000be6807df>] __se_sys_open fs/open.c:1192 [inline]
    [<00000000be6807df>] __x64_sys_open+0x7d/0xe0 fs/open.c:1192
    [<00000000ea2012e0>] do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
    [<00000000e7253572>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

[  323.608401][  


---
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