linux-kernel - Re: [PATCH v4 1/4] media: venus: hfi_parser: add check to avoid out of bound access

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Message-ID: <41e9f6a8-1f72-465e-b6c4-0bebdc462d31@xs4all.nl>
Date: Thu, 20 Feb 2025 16:16:38 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Vikash Garodia <quic_vgarodia@...cinc.com>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Tomasz Figa
 <tfiga@...omium.org>, Hans Verkuil <hans.verkuil@...co.com>
Cc: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
 Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
 Dmitry Baryshkov <dmitry.baryshkov@...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 v4 1/4] media: venus: hfi_parser: add check to avoid out
 of bound access

On 2/7/25 09:24, Vikash Garodia wrote:
> There is a possibility that init_codecs is invoked multiple times during
> manipulated payload from video firmware. In such case, if codecs_count
> can get incremented to value more than MAX_CODEC_NUM, there can be OOB
> access. Reset the count so that it always starts from beginning.
> 
> Cc: stable@...r.kernel.org
> Fixes: 1a73374a04e5 ("media: venus: hfi_parser: add common capability parser")
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> ---
>  drivers/media/platform/qcom/venus/hfi_parser.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/media/platform/qcom/venus/hfi_parser.c b/drivers/media/platform/qcom/venus/hfi_parser.c
> index 3df241dc3a118bcdeb2c28a6ffdb907b644d5653..1cc17f3dc8948160ea6c3015d2c03e475b8aa29e 100644
> --- a/drivers/media/platform/qcom/venus/hfi_parser.c
> +++ b/drivers/media/platform/qcom/venus/hfi_parser.c
> @@ -17,6 +17,7 @@ typedef void (*func)(struct hfi_plat_caps *cap, const void *data,
>  static void init_codecs(struct venus_core *core)
>  {
>  	struct hfi_plat_caps *caps = core->caps, *cap;
> +	core->codecs_count = 0;

This really should be moved down to before the 'if'. There is no reason to mix the assignment
with variable declarations.

>  	unsigned long bit;
>  
>  	if (hweight_long(core->dec_codecs) + hweight_long(core->enc_codecs) > MAX_CODEC_NUM)
> 

Regards,

	Hans