linux-kernel - [syzbot] [net?] memory leak in copy_net

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Message-ID: <0000000000009fffb7060b750f4f@google.com>
Date:   Fri, 01 Dec 2023 08:14:21 -0800
From:   syzbot <syzbot+989b6c53cd6d6ec47ab2@...kaller.appspotmail.com>
To:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pabeni@...hat.com, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [net?] memory leak in copy_net_ns (2)

Hello,

syzbot found the following issue on:

HEAD commit:    e017769f4ce2 Merge tag 'for-6.6-rc7-tag' of git://git.kern..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10277593680000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c4e4700f1727d30
dashboard link: https://syzkaller.appspot.com/bug?extid=989b6c53cd6d6ec47ab2
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=174e61ed680000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/52a9cd027b72/disk-e017769f.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/646078695995/vmlinux-e017769f.xz
kernel image: https://storage.googleapis.com/syzbot-assets/a78855f93880/bzImage-e017769f.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+989b6c53cd6d6ec47ab2@...kaller.appspotmail.com

BUG: memory leak
unreferenced object 0xffff88810e8d3660 (size 32):
  comm "syz-executor.3", pid 5088, jiffies 4294979538 (age 423.340s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81574aa5>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1117
    [<ffffffff83eb94f0>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83eb94f0>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83eb94f0>] net_alloc net/core/net_namespace.c:422 [inline]
    [<ffffffff83eb94f0>] copy_net_ns+0xc0/0x3d0 net/core/net_namespace.c:476
    [<ffffffff812db5d7>] create_new_namespaces+0x197/0x500 kernel/nsproxy.c:110
    [<ffffffff812dc012>] unshare_nsproxy_namespaces+0xa2/0x120 kernel/nsproxy.c:228
    [<ffffffff81293f84>] ksys_unshare+0x314/0x610 kernel/fork.c:3435
    [<ffffffff81294296>] __do_sys_unshare kernel/fork.c:3506 [inline]
    [<ffffffff81294296>] __se_sys_unshare kernel/fork.c:3504 [inline]
    [<ffffffff81294296>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:3504
    [<ffffffff84b2b548>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b2b548>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff88810e8d3fa0 (size 32):
  comm "syz-executor.4", pid 5078, jiffies 4294979546 (age 423.260s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81574aa5>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1117
    [<ffffffff83eb94f0>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83eb94f0>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83eb94f0>] net_alloc net/core/net_namespace.c:422 [inline]
    [<ffffffff83eb94f0>] copy_net_ns+0xc0/0x3d0 net/core/net_namespace.c:476
    [<ffffffff812db5d7>] create_new_namespaces+0x197/0x500 kernel/nsproxy.c:110
    [<ffffffff812dc012>] unshare_nsproxy_namespaces+0xa2/0x120 kernel/nsproxy.c:228
    [<ffffffff81293f84>] ksys_unshare+0x314/0x610 kernel/fork.c:3435
    [<ffffffff81294296>] __do_sys_unshare kernel/fork.c:3506 [inline]
    [<ffffffff81294296>] __se_sys_unshare kernel/fork.c:3504 [inline]
    [<ffffffff81294296>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:3504
    [<ffffffff84b2b548>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b2b548>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888111239400 (size 32):
  comm "syz-executor.1", pid 5075, jiffies 4294979553 (age 423.190s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81574aa5>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1117
    [<ffffffff83eb94f0>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83eb94f0>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83eb94f0>] net_alloc net/core/net_namespace.c:422 [inline]
    [<ffffffff83eb94f0>] copy_net_ns+0xc0/0x3d0 net/core/net_namespace.c:476
    [<ffffffff812db5d7>] create_new_namespaces+0x197/0x500 kernel/nsproxy.c:110
    [<ffffffff812dc012>] unshare_nsproxy_namespaces+0xa2/0x120 kernel/nsproxy.c:228
    [<ffffffff81293f84>] ksys_unshare+0x314/0x610 kernel/fork.c:3435
    [<ffffffff81294296>] __do_sys_unshare kernel/fork.c:3506 [inline]
    [<ffffffff81294296>] __se_sys_unshare kernel/fork.c:3504 [inline]
    [<ffffffff81294296>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:3504
    [<ffffffff84b2b548>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b2b548>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888111239840 (size 32):
  comm "syz-executor.7", pid 5076, jiffies 4294979555 (age 423.170s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81574aa5>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1117
    [<ffffffff83eb94f0>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83eb94f0>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83eb94f0>] net_alloc net/core/net_namespace.c:422 [inline]
    [<ffffffff83eb94f0>] copy_net_ns+0xc0/0x3d0 net/core/net_namespace.c:476
    [<ffffffff812db5d7>] create_new_namespaces+0x197/0x500 kernel/nsproxy.c:110
    [<ffffffff812dc012>] unshare_nsproxy_namespaces+0xa2/0x120 kernel/nsproxy.c:228
    [<ffffffff81293f84>] ksys_unshare+0x314/0x610 kernel/fork.c:3435
    [<ffffffff81294296>] __do_sys_unshare kernel/fork.c:3506 [inline]
    [<ffffffff81294296>] __se_sys_unshare kernel/fork.c:3504 [inline]
    [<ffffffff81294296>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:3504
    [<ffffffff84b2b548>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b2b548>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

BUG: memory leak
unreferenced object 0xffff888143eae6c0 (size 32):
  comm "syz-executor.6", pid 5077, jiffies 4294979559 (age 423.180s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 01 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<ffffffff81574aa5>] kmalloc_trace+0x25/0x90 mm/slab_common.c:1117
    [<ffffffff83eb94f0>] kmalloc include/linux/slab.h:599 [inline]
    [<ffffffff83eb94f0>] kzalloc include/linux/slab.h:720 [inline]
    [<ffffffff83eb94f0>] net_alloc net/core/net_namespace.c:422 [inline]
    [<ffffffff83eb94f0>] copy_net_ns+0xc0/0x3d0 net/core/net_namespace.c:476
    [<ffffffff812db5d7>] create_new_namespaces+0x197/0x500 kernel/nsproxy.c:110
    [<ffffffff812dc012>] unshare_nsproxy_namespaces+0xa2/0x120 kernel/nsproxy.c:228
    [<ffffffff81293f84>] ksys_unshare+0x314/0x610 kernel/fork.c:3435
    [<ffffffff81294296>] __do_sys_unshare kernel/fork.c:3506 [inline]
    [<ffffffff81294296>] __se_sys_unshare kernel/fork.c:3504 [inline]
    [<ffffffff81294296>] __x64_sys_unshare+0x16/0x20 kernel/fork.c:3504
    [<ffffffff84b2b548>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84b2b548>] do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

[  846.


---
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