linux-kernel - Re: [PATCH v2] media: usb: uvc: Fix NULL pointer dereference during USB device hot-unplug

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Message-ID: <65a0e74c-a9ee-4237-b8c9-9863e4de64b5@kylinos.cn>
Date: Mon, 24 Nov 2025 11:07:45 +0800
From: Jie Deng <dengjie03@...inos.cn>
To: Ricardo Ribalda <ribalda@...omium.org>
Cc: laurent.pinchart@...asonboard.com, hansg@...nel.org, mchehab@...nel.org,
 kieran.bingham@...asonboard.com, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] media: usb: uvc: Fix NULL pointer dereference during
 USB device hot-unplug

Hi Ricardo

Thank you for your reply

在 2025/11/22 16:17, Ricardo Ribalda 写道:
> Hi Jie
>
> On Sat, 22 Nov 2025 at 08:26, Jie Deng <dengjie03@...inos.cn> wrote:
>> Add safety checks to prevent kernel panic during the race window in
>> USB device disconnection.
> Can you share the kernel version that you are using?
The kernel version I'm using is 5.4.18
>
> This patch
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c93d73c9c2cfa7658f7100d201a47c4856746222
> Should prevent the race that you are describing.
>
>
> In your trace you have a reference to uvc_queue_streamoff that was
> deleted by that patch

This patch may indeed eliminate the problem I described.

The 5.4 longterm version should not have synchronized this patch？


Thanks,

Jie Deng