Re: [PATCH v2] media: verisilicon: Fix crash when probing encoder

[Nicolas Dufresne]

Hi,

cause I sent a Rb on old one after v2 was sent, the extra cleanup make sense to
me.

Le jeudi 13 avril 2023 à 12:47 +0200, Benjamin Gaignard a écrit :
> ctx->vpu_dst_fmt is no more initialized before calling hantro_try_fmt()
> so assigne it to vpu_fmt led to crash the kernel.
> Like for decoder case use 'fmt' as format for encoder and clean up
> the code.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Fixes: db6f68b51e5c ("media: verisilicon: Do not set context src/dst formats in reset functions")


Reviewed-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>

> ---
> version 2:
> - Remove useless vpu_fmt.
> 
>  drivers/media/platform/verisilicon/hantro_v4l2.c | 10 +++-------
>  1 file changed, 3 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c b/drivers/media/platform/verisilicon/hantro_v4l2.c
> index 8f1414085f47..d71f79471396 100644
> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
> @@ -275,7 +275,7 @@ static int hantro_try_fmt(const struct hantro_ctx *ctx,
>  			  struct v4l2_pix_format_mplane *pix_mp,
>  			  enum v4l2_buf_type type)
>  {
> -	const struct hantro_fmt *fmt, *vpu_fmt;
> +	const struct hantro_fmt *fmt;
>  	bool capture = V4L2_TYPE_IS_CAPTURE(type);
>  	bool coded;
>  
> @@ -295,11 +295,7 @@ static int hantro_try_fmt(const struct hantro_ctx *ctx,
>  
>  	if (coded) {
>  		pix_mp->num_planes = 1;
> -		vpu_fmt = fmt;
> -	} else if (ctx->is_encoder) {
> -		vpu_fmt = ctx->vpu_dst_fmt;
> -	} else {
> -		vpu_fmt = fmt;
> +	} else if (!ctx->is_encoder) {
>  		/*
>  		 * Width/height on the CAPTURE end of a decoder are ignored and
>  		 * replaced by the OUTPUT ones.
> @@ -311,7 +307,7 @@ static int hantro_try_fmt(const struct hantro_ctx *ctx,
>  	pix_mp->field = V4L2_FIELD_NONE;
>  
>  	v4l2_apply_frmsize_constraints(&pix_mp->width, &pix_mp->height,
> -				       &vpu_fmt->frmsize);
> +				       &fmt->frmsize);
>  
>  	if (!coded) {
>  		/* Fill remaining fields */
> -- 
> 2.34.1
> 
>