linux-kernel - Re: [PATCH 1/2] rkvdec: h264: Refuse to decode unsupported bitstream

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Message-ID: <551304f5-88bd-a673-a0ef-47af65700fe7@kwiboo.se>
Date:   Mon, 06 Jul 2020 09:45:46 +0000 (UTC)
From:   Jonas Karlman <jonas@...boo.se>
To:     Ezequiel Garcia <ezequiel@...labora.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        kernel@...labora.com
Subject: Re: [PATCH 1/2] rkvdec: h264: Refuse to decode unsupported bitstream

On 2020-06-26 19:11, Ezequiel Garcia wrote:
> The hardware only supports 4:2:2, 4:2:0 or 4:0:0 (monochrome),
> 8-bit or 10-bit depth content.
> 
> Verify that the PPS refers to a supported bitstream, and refuse

This should be SPS not PPS, same for hantro patch.

> unsupported bitstreams by failing at TRY_EXT_CTRLS time.
> 
> The driver is currently broken on 10-bit and 4:2:2
> so disallow those as well.
> 
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> ---
>  drivers/staging/media/rkvdec/rkvdec.c | 27 +++++++++++++++++++++++++++
>  1 file changed, 27 insertions(+)
> 
> diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
> index 225eeca73356..0f81b47792f6 100644
> --- a/drivers/staging/media/rkvdec/rkvdec.c
> +++ b/drivers/staging/media/rkvdec/rkvdec.c
> @@ -27,6 +27,32 @@
>  #include "rkvdec.h"
>  #include "rkvdec-regs.h"
>  
> +static int rkvdec_try_ctrl(struct v4l2_ctrl *ctrl)
> +{
> +	if (ctrl->id == V4L2_CID_MPEG_VIDEO_H264_SPS) {
> +		const struct v4l2_ctrl_h264_sps *sps = ctrl->p_cur.p;

This should be p_new and not p_cur to validate the new ctrl value, same for hantro patch.

With both fixed this and the hantro patch is,

Reviewed-by: Jonas Karlman <jonas@...boo.se>

Regards,
Jonas

> +		/*
> +		 * TODO: The hardware supports 10-bit and 4:2:2 profiles,
> +		 * but it's currently broken in the driver.
> +		 * Reject them for now, until it's fixed.
> +		 */
> +		if (sps->chroma_format_idc > 1)
> +			/* Only 4:0:0 and 4:2:0 are supported */
> +			return -EINVAL;
> +		if (sps->bit_depth_luma_minus8 != sps->bit_depth_chroma_minus8)
> +			/* Luma and chroma bit depth mismatch */
> +			return -EINVAL;
> +		if (sps->bit_depth_luma_minus8 != 0)
> +			/* Only 8-bit is supported */
> +			return -EINVAL;
> +	}
> +	return 0;
> +}
> +
> +static const struct v4l2_ctrl_ops rkvdec_ctrl_ops = {
> +	.try_ctrl = rkvdec_try_ctrl,
> +};
> +
>  static const struct rkvdec_ctrl_desc rkvdec_h264_ctrl_descs[] = {
>  	{
>  		.per_request = true,
> @@ -42,6 +68,7 @@ static const struct rkvdec_ctrl_desc rkvdec_h264_ctrl_descs[] = {
>  		.per_request = true,
>  		.mandatory = true,
>  		.cfg.id = V4L2_CID_MPEG_VIDEO_H264_SPS,
> +		.cfg.ops = &rkvdec_ctrl_ops,
>  	},
>  	{
>  		.per_request = true,
>