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Subject: Re: [PATCH] mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq
From:   patchwork-bot+netdevbpf@kernel.org
Message-Id: <166534201455.6058.9588339706087338743.git-patchwork-notify@kernel.org>
Date:   Sun, 09 Oct 2022 19:00:14 +0000
References: <20221009063731.22733-1-duoming@zju.edu.cn>
In-Reply-To: <20221009063731.22733-1-duoming@zju.edu.cn>
To:     Duoming Zhou <duoming@zju.edu.cn>
Cc:     linux-kernel@vger.kernel.org, isdn@linux-pingi.de, kuba@kernel.org,
        andrii@kernel.org, gregkh@linuxfoundation.org, axboe@kernel.dk,
        davem@davemloft.net, netdev@vger.kernel.org, zou_wei@huawei.com
Precedence: bulk

Hello:

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

On Sun,  9 Oct 2022 14:37:31 +0800 you wrote:
> The function hfcpci_softirq() is a timer handler. If it
> is running, the timer_pending() will return 0 and the
> del_timer_sync() in HFC_cleanup() will not be executed.
> As a result, the use-after-free bug will happen. The
> process is shown below:
> 
>     (cleanup routine)          |        (timer handler)
> HFC_cleanup()                  | hfcpci_softirq()
>  if (timer_pending(&hfc_tl))   |
>    del_timer_sync()            |
>  ...                           | ...
>  pci_unregister_driver(hc)     |
>   driver_unregister            |  driver_for_each_device
>    bus_remove_driver           |   _hfcpci_softirq
>     driver_detach              |   ...
>      put_device(dev) //[1]FREE |
>                                |    dev_get_drvdata(dev) //[2]USE
> 
> [...]

Here is the summary with links:
  - mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq
    https://git.kernel.org/netdev/net/c/175302f6b79e

You are awesome, thank you!
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