Re: [PATCH net v2] net: caif: Fix use-after-free in cfusbl_device_notify()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@xxxxxxxxxx>:

On Thu,  2 Mar 2023 01:39:13 +0900 you wrote:
> syzbot reported use-after-free in cfusbl_device_notify() [1].  This
> causes a stack trace like below:
> 
> BUG: KASAN: use-after-free in cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138
> Read of size 8 at addr ffff88807ac4e6f0 by task kworker/u4:6/1214
> 
> CPU: 0 PID: 1214 Comm: kworker/u4:6 Not tainted 5.19.0-rc3-syzkaller-00146-g92f20ff72066 #0
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
> Workqueue: netns cleanup_net
> Call Trace:
>  <TASK>
>  __dump_stack lib/dump_stack.c:88 [inline]
>  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
>  print_address_description.constprop.0.cold+0xeb/0x467 mm/kasan/report.c:313
>  print_report mm/kasan/report.c:429 [inline]
>  kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
>  cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138
>  notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
>  call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1945
>  call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]
>  call_netdevice_notifiers net/core/dev.c:1997 [inline]
>  netdev_wait_allrefs_any net/core/dev.c:10227 [inline]
>  netdev_run_todo+0xbc0/0x10f0 net/core/dev.c:10341
>  default_device_exit_batch+0x44e/0x590 net/core/dev.c:11334
>  ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
>  cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
>  process_one_work+0x996/0x1610 kernel/workqueue.c:2289
>  worker_thread+0x665/0x1080 kernel/workqueue.c:2436
>  kthread+0x2e9/0x3a0 kernel/kthread.c:376
>  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302
>  </TASK>
> 
> [...]

Here is the summary with links:
  - [net,v2] net: caif: Fix use-after-free in cfusbl_device_notify()
    https://git.kernel.org/netdev/net/c/9781e98a9711

You are awesome, thank you!
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