netdev - Re: [PATCH net] nfc: pn533: Fix use-after-free bugs caused by pn532_cmd

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Date:   Mon, 22 Aug 2022 14:00:15 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Duoming Zhou <duoming@....edu.cn>
Cc:     netdev@...r.kernel.org, krzysztof.kozlowski@...aro.org,
        linux-kernel@...r.kernel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, alexander.deucher@....com,
        broonie@...nel.org, kuba@...nel.org
Subject: Re: [PATCH net] nfc: pn533: Fix use-after-free bugs caused by
 pn532_cmd_timeout

Hello:

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

On Thu, 18 Aug 2022 17:06:21 +0800 you wrote:
> When the pn532 uart device is detaching, the pn532_uart_remove()
> is called. But there are no functions in pn532_uart_remove() that
> could delete the cmd_timeout timer, which will cause use-after-free
> bugs. The process is shown below:
> 
>     (thread 1)                  |        (thread 2)
>                                 |  pn532_uart_send_frame
> pn532_uart_remove               |    mod_timer(&pn532->cmd_timeout,...)
>   ...                           |    (wait a time)
>   kfree(pn532) //FREE           |    pn532_cmd_timeout
>                                 |      pn532_uart_send_frame
>                                 |        pn532->... //USE
> 
> [...]

Here is the summary with links:
  - [net] nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout
    https://git.kernel.org/netdev/net/c/f1e941dbf80a

You are awesome, thank you!
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