linux-kernel - Re: [PATCH v3] media: venus: fix use after free in vdec

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Date: Mon, 6 May 2024 09:33:52 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Hans Verkuil <hans.verkuil@...co.com>
Cc: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Stanimir Varbanov <stanimir.varbanov@...aro.org>,
 linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v3] media: venus: fix use after free in vdec_close

On 06/05/2024 07:58, Dikshita Agarwal wrote:
> There appears to be a possible use after free with vdec_close().
> The firmware will add buffer release work to the work queue through
> HFI callbacks as a normal part of decoding. Randomly closing the
> decoder device from userspace during normal decoding can incur
> a read after free for inst.
> 
> Fix it by cancelling the work in vdec_close.
> 
> Cc: stable@...r.kernel.org
> Fixes: af2c3834c ("media: venus: adding core part and helper functions")

Please run scripts/checkpatch.pl and fix reported warnings. Then please
run `scripts/checkpatch.pl --strict` and (probably) fix more warnings.
Some warnings can be ignored, especially from --strict run, but the code
here looks like it needs a fix. Feel free to get in touch if the warning
is not clear.

This is written in your instruction - go/upstream - so be sure you
always follow it fully.


Best regards,
Krzysztof