netdev - Re: [PATCH V3] drivers: hamradio: 6pack: fix UAF bug caused by mod

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Date:   Fri, 18 Feb 2022 11:00:09 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     周多明 <duoming@....edu.cn>@ci.codeaurora.org
Cc:     linux-hams@...r.kernel.org, kuba@...nel.org,
        ajk@...nets.uni-bremen.de, davem@...emloft.net,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linma@....edu.cn
Subject: Re: [PATCH V3] drivers: hamradio: 6pack: fix UAF bug caused by
 mod_timer()

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@...emloft.net>:

On Thu, 17 Feb 2022 09:43:03 +0800 you wrote:
> When a 6pack device is detaching, the sixpack_close() will act to cleanup
> necessary resources. Although del_timer_sync() in sixpack_close()
> won't return if there is an active timer, one could use mod_timer() in
> sp_xmit_on_air() to wake up timer again by calling userspace syscall such
> as ax25_sendmsg(), ax25_connect() and ax25_ioctl().
> 
> This unexpected waked handler, sp_xmit_on_air(), realizes nothing about
> the undergoing cleanup and may still call pty_write() to use driver layer
> resources that have already been released.
> 
> [...]

Here is the summary with links:
  - [V3] drivers: hamradio: 6pack: fix UAF bug caused by mod_timer()
    https://git.kernel.org/netdev/net/c/efe4186e6a1b

You are awesome, thank you!
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