linux-kernel - Re: [PATCH] atm: idt77252: fix use-after-free bugs caused by tst

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Date:   Tue, 09 Aug 2022 04:00:14 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Duoming Zhou <duoming@....edu.cn>
Cc:     linux-atm-general@...ts.sourceforge.net, 3chas3@...il.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] atm: idt77252: fix use-after-free bugs caused by tst_timer

Hello:

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

On Fri,  5 Aug 2022 15:00:08 +0800 you wrote:
> There are use-after-free bugs caused by tst_timer. The root cause
> is that there are no functions to stop tst_timer in idt77252_exit().
> One of the possible race conditions is shown below:
> 
>     (thread 1)          |        (thread 2)
>                         |  idt77252_init_one
>                         |    init_card
>                         |      fill_tst
>                         |        mod_timer(&card->tst_timer, ...)
> idt77252_exit           |  (wait a time)
>                         |  tst_timer
>                         |
>                         |    ...
>   kfree(card) // FREE   |
>                         |    card->soft_tst[e] // USE
> 
> [...]

Here is the summary with links:
  - atm: idt77252: fix use-after-free bugs caused by tst_timer
    https://git.kernel.org/netdev/net/c/3f4093e2bf46

You are awesome, thank you!
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