Subject: Re: [PATCH] mISDN: hfcpci: Fix use-after-free bug in hfcpci_softirq

From: [email-masked]
Date: Sun, 09 Oct 2022 19:00:14 +0000

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <[email-masked]>:

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!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html