Re: [PATCH net v2] net: rose: fix UAF bug caused by rose_t0timer_expiry

[patchwork-bot+netdevbpf]

Hello:

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

On Tue,  5 Jul 2022 20:56:10 +0800 you wrote:
> There are UAF bugs caused by rose_t0timer_expiry(). The
> root cause is that del_timer() could not stop the timer
> handler that is running and there is no synchronization.
> One of the race conditions is shown below:
> 
>     (thread 1)             |        (thread 2)
>                            | rose_device_event
>                            |   rose_rt_device_down
>                            |     rose_remove_neigh
> rose_t0timer_expiry        |       rose_stop_t0timer(rose_neigh)
>   ...                      |         del_timer(&neigh->t0timer)
>                            |         kfree(rose_neigh) //[1]FREE
>   neigh->dce_mode //[2]USE |
> 
> [...]

Here is the summary with links:
  - [net,v2] net: rose: fix UAF bug caused by rose_t0timer_expiry
    https://git.kernel.org/netdev/net/c/148ca0451807

You are awesome, thank you!
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