linux-kernel - Re: [PATCH] NFC: NULL out the dev->rfkill to prevent UAF

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Message-Id: <164984941258.14313.4753120813378621079.git-patchwork-notify@kernel.org>
Date:   Wed, 13 Apr 2022 11:30:12 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Lin Ma <linma@....edu.cn>
Cc:     krzk@...nel.org, davem@...emloft.net, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] NFC: NULL out the dev->rfkill to prevent UAF

Hello:

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

On Tue, 12 Apr 2022 13:32:08 +0800 you wrote:
> Commit 3e3b5dfcd16a ("NFC: reorder the logic in nfc_{un,}register_device")
> assumes the device_is_registered() in function nfc_dev_up() will help
> to check when the rfkill is unregistered. However, this check only
> take effect when device_del(&dev->dev) is done in nfc_unregister_device().
> Hence, the rfkill object is still possible be dereferenced.
> 
> The crash trace in latest kernel (5.18-rc2):
> 
> [...]

Here is the summary with links:
  - NFC: NULL out the dev->rfkill to prevent UAF
    https://git.kernel.org/netdev/net-next/c/1b0e81416a24

You are awesome, thank you!
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