linux-kernel - Re: [PATCH v4 2/6] media: venus: vdec: Ignore parm smaller than 1fps

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Message-ID: <4df2adac-c9d8-46f5-ad92-105b91f8ae4e@linaro.org>
Date: Mon, 6 Jan 2025 14:08:03 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Ricardo Ribalda <ribalda@...omium.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>,
 Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Hans Verkuil <hans.verkuil@...co.com>, Hans Verkuil <hverkuil@...all.nl>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 Stanimir Varbanov <stanimir.varbanov@...aro.org>,
 linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v4 2/6] media: venus: vdec: Ignore parm smaller than 1fps

On 06/01/2025 13:40, Ricardo Ribalda wrote:
> The driver uses "whole" fps in all its calculations (e.g. in
> load_per_instance()) Return -EINVAL if the user provides a parm that
> will result in 0 whole fps.
> 
> Reported-by: Hans Verkuil <hverkuil@...all.nl>
> Closes: https://lore.kernel.org/linux-media/f11653a7-bc49-48cd-9cdb-1659147453e4@xs4all.nl/T/#m91cd962ac942834654f94c92206e2f85ff7d97f0
> Fixes: 7472c1c69138 ("[media] media: venus: vdec: add video decoder files")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>   drivers/media/platform/qcom/venus/vdec.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 98c22b9f9372..25edd77b9cf9 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -481,7 +481,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a)
>   	us_per_frame = timeperframe->numerator * (u64)USEC_PER_SEC;
>   	do_div(us_per_frame, timeperframe->denominator);
>   
> -	if (!us_per_frame)
> +	if (!us_per_frame || us_per_frame > USEC_PER_SEC)
>   		return -EINVAL;
>   
>   	fps = (u64)USEC_PER_SEC;
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>