[PATCH v2 1/1] mtk-vcodec: check the vp9 decoder buffer index from VPU.

[Tiffany Lin]

On Tue, 2017-03-07 at 22:42 +0800, Wu-Cheng Li wrote:
> From: Wu-Cheng Li <wuchengli at google.com>
> 
> VPU firmware has a bug and may return invalid buffer index for
> some vp9 videos. Check the buffer indexes before accessing the
> buffer.
> 
> Signed-off-by: Wu-Cheng Li <wuchengli at chromium.org>
> ---
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c | 23 ++++++++++++++-----
>  drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h |  2 ++
>  .../media/platform/mtk-vcodec/vdec/vdec_vp9_if.c   | 26 ++++++++++++++++++++++
>  drivers/media/platform/mtk-vcodec/vdec_drv_if.h    |  2 ++
>  4 files changed, 48 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> index 502877a4b1df..8a9285a84d47 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.c
> @@ -420,6 +420,11 @@ static void mtk_vdec_worker(struct work_struct *work)
>  			dst_buf->index,
>  			ret, res_chg);
>  		src_buf = v4l2_m2m_src_buf_remove(ctx->m2m_ctx);
> +		if (ret == -EIO) {
> +			mutex_lock(&ctx->lock);
> +			src_buf_info->error = true;
> +			mutex_unlock(&ctx->lock);
> +		}
>  		v4l2_m2m_buf_done(&src_buf_info->vb, VB2_BUF_STATE_ERROR);
>  	} else if (res_chg == false) {
>  		/*
> @@ -1176,6 +1181,11 @@ static void vb2ops_vdec_buf_queue(struct vb2_buffer *vb)
>  			       "[%d] vdec_if_decode() src_buf=%d, size=%zu, fail=%d, res_chg=%d",
>  			       ctx->id, src_buf->index,
>  			       src_mem.size, ret, res_chg);
> +		if (ret == -EIO) {
> +			mtk_v4l2_err("[%d] Unrecoverable error in vdec_if_decode.",
> +					ctx->id);
> +			ctx->state = MTK_STATE_ABORT;
> +		}
Should we set buf status to VB2_BUF_STATE_ERROR in this case?

>  		return;
>  	}
>  
> @@ -1217,14 +1227,17 @@ static void vb2ops_vdec_buf_finish(struct vb2_buffer *vb)
>  	struct vb2_v4l2_buffer *vb2_v4l2;
>  	struct mtk_video_dec_buf *buf;
>  
> -	if (vb->vb2_queue->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> -		return;
> -
>  	vb2_v4l2 = container_of(vb, struct vb2_v4l2_buffer, vb2_buf);
>  	buf = container_of(vb2_v4l2, struct mtk_video_dec_buf, vb);
>  	mutex_lock(&ctx->lock);
> -	buf->queued_in_v4l2 = false;
> -	buf->queued_in_vb2 = false;
> +	if (buf->error) {
> +		mtk_v4l2_err("Unrecoverable error on buffer.");
Remove mtk_v4l2_err out of mutex_lock/mutex_unlock?


best regards,
Tiffany
> +		ctx->state = MTK_STATE_ABORT;
> +	}
> +	if (vb->vb2_queue->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		buf->queued_in_v4l2 = false;
> +		buf->queued_in_vb2 = false;
> +	}
>  	mutex_unlock(&ctx->lock);
>  }
>  
> diff --git a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> index 362f5a85762e..dc4fc1df63c5 100644
> --- a/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> +++ b/drivers/media/platform/mtk-vcodec/mtk_vcodec_dec.h
> @@ -50,6 +50,7 @@ struct vdec_fb {
>   * @queued_in_v4l2:	Capture buffer is in v4l2 driver, but not in vb2
>   *			queue yet
>   * @lastframe:		Intput buffer is last buffer - EOS
> + * @error:		An unrecoverable error occurs on this buffer.
>   * @frame_buffer:	Decode status, and buffer information of Capture buffer
>   *
>   * Note : These status information help us track and debug buffer state
> @@ -63,6 +64,7 @@ struct mtk_video_dec_buf {
>  	bool	queued_in_vb2;
>  	bool	queued_in_v4l2;
>  	bool	lastframe;
> +	bool	error;
>  	struct vdec_fb	frame_buffer;
>  };
>  
> diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> index e91a3b425b0c..5539b1853f16 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> +++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> @@ -718,6 +718,26 @@ static void get_free_fb(struct vdec_vp9_inst *inst, struct vdec_fb **out_fb)
>  	*out_fb = fb;
>  }
>  
> +static int validate_vsi_array_indexes(struct vdec_vp9_inst *inst,
> +		struct vdec_vp9_vsi *vsi) {
> +	if (vsi->sf_frm_idx >= VP9_MAX_FRM_BUF_NUM - 1) {
> +		mtk_vcodec_err(inst, "Invalid vsi->sf_frm_idx=%u.",
> +				vsi->sf_frm_idx);
> +		return -EIO;
> +	}
> +	if (vsi->frm_to_show_idx >= VP9_MAX_FRM_BUF_NUM) {
> +		mtk_vcodec_err(inst, "Invalid vsi->frm_to_show_idx=%u.",
> +				vsi->frm_to_show_idx);
> +		return -EIO;
> +	}
> +	if (vsi->new_fb_idx >= VP9_MAX_FRM_BUF_NUM) {
> +		mtk_vcodec_err(inst, "Invalid vsi->new_fb_idx=%u.",
> +				vsi->new_fb_idx);
> +		return -EIO;
> +	}
> +	return 0;
> +}
> +
>  static void vdec_vp9_deinit(unsigned long h_vdec)
>  {
>  	struct vdec_vp9_inst *inst = (struct vdec_vp9_inst *)h_vdec;
> @@ -834,6 +854,12 @@ static int vdec_vp9_decode(unsigned long h_vdec, struct mtk_vcodec_mem *bs,
>  			goto DECODE_ERROR;
>  		}
>  
> +		ret = validate_vsi_array_indexes(inst, vsi);
> +		if (ret) {
> +			mtk_vcodec_err(inst, "Invalid values from VPU.");
> +			goto DECODE_ERROR;
> +		}
> +
>  		if (vsi->resolution_changed) {
>  			if (!vp9_alloc_work_buf(inst)) {
>  				ret = -EINVAL;
> diff --git a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> index db6b5205ffb1..ded1154481cd 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> +++ b/drivers/media/platform/mtk-vcodec/vdec_drv_if.h
> @@ -85,6 +85,8 @@ void vdec_if_deinit(struct mtk_vcodec_ctx *ctx);
>   * @res_chg	: [out] resolution change happens if current bs have different
>   *	picture width/height
>   * Note: To flush the decoder when reaching EOF, set input bitstream as NULL.
> + *
> + * Return: 0 on success. -EIO on unrecoverable error.
>   */
>  int vdec_if_decode(struct mtk_vcodec_ctx *ctx, struct mtk_vcodec_mem *bs,
>  		   struct vdec_fb *fb, bool *res_chg);