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Subject: Re: [PATCH net] nfc: pn533: Fix use-after-free bugs caused by
 pn532_cmd_timeout
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <166117681546.22523.17720942204050886000.git-patchwork-notify@kernel.org>
Date:   Mon, 22 Aug 2022 14:00:15 +0000
References: <20220818090621.106094-1-duoming@zju.edu.cn>
In-Reply-To: <20220818090621.106094-1-duoming@zju.edu.cn>
To:     Duoming Zhou <duoming@zju.edu.cn>
Cc:     netdev@vger.kernel.org, krzysztof.kozlowski@linaro.org,
        linux-kernel@vger.kernel.org, davem@davemloft.net,
        gregkh@linuxfoundation.org, alexander.deucher@amd.com,
        broonie@kernel.org, kuba@kernel.org
Precedence: bulk

Hello:

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