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Date: Thu, 14 Jul 2022 15:26:18 -0400
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Hans Verkuil <hverkuil-cisco@...all.nl>,
Tomasz Figa <tfiga@...omium.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Maxime Ripard <mripard@...nel.org>,
Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
Jernej Skrabec <jernej.skrabec@...il.com>
Subject: Re: [PATCH v2 7/8] cedrus: Use vb2_find_buffer
Hi Ezequiel,
I started testing with these patches and found some NULL dreferences, see my
comment inline...
Le lundi 11 juillet 2022 à 18:11 -0300, Ezequiel Garcia a écrit :
> Use the newly introduced vb2_find_buffer API to get a vb2_buffer
> given a buffer timestamp.
>
> Cc: Maxime Ripard <mripard@...nel.org>
> Cc: Paul Kocialkowski <paul.kocialkowski@...tlin.com>
> Cc: Jernej Skrabec <jernej.skrabec@...il.com>
> Signed-off-by: Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
> Acked-by: Tomasz Figa <tfiga@...omium.org>
> ---
> drivers/staging/media/sunxi/cedrus/cedrus.h | 24 ++++++-----
> .../staging/media/sunxi/cedrus/cedrus_h264.c | 16 +++----
> .../staging/media/sunxi/cedrus/cedrus_h265.c | 16 +++----
> .../staging/media/sunxi/cedrus/cedrus_mpeg2.c | 28 ++++--------
> .../staging/media/sunxi/cedrus/cedrus_vp8.c | 43 ++++---------------
> 5 files changed, 46 insertions(+), 81 deletions(-)
>
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
> index 3bc094eb497f..c054dbe3d3bc 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus.h
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
> @@ -233,19 +233,23 @@ static inline dma_addr_t cedrus_buf_addr(struct vb2_buffer *buf,
> }
>
> static inline dma_addr_t cedrus_dst_buf_addr(struct cedrus_ctx *ctx,
> - int index, unsigned int plane)
> + struct vb2_buffer *buf,
> + unsigned int plane)
> {
> - struct vb2_buffer *buf = NULL;
> - struct vb2_queue *vq;
> -
> - if (index < 0)
> - return 0;
> + return buf ? cedrus_buf_addr(buf, &ctx->dst_fmt, plane) : 0;
> +}
>
> - vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
> - if (vq)
> - buf = vb2_get_buffer(vq, index);
> +static inline void cedrus_write_ref_buf_addr(struct cedrus_ctx *ctx,
> + struct vb2_queue *q,
> + u64 timestamp,
> + u32 luma_reg,
> + u32 chroma_reg)
> +{
> + struct cedrus_dev *dev = ctx->dev;
> + struct vb2_buffer *buf = vb2_find_buffer(q, timestamp);
>
> - return buf ? cedrus_buf_addr(buf, &ctx->dst_fmt, plane) : 0;
> + cedrus_write(dev, luma_reg, cedrus_dst_buf_addr(ctx, buf, 0));
> + cedrus_write(dev, chroma_reg, cedrus_dst_buf_addr(ctx, buf, 1));
> }
>
> static inline struct cedrus_buffer *
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> index d8fb93035470..0559efeac125 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> @@ -111,16 +111,16 @@ static void cedrus_write_frame_list(struct cedrus_ctx *ctx,
> for (i = 0; i < ARRAY_SIZE(decode->dpb); i++) {
> const struct v4l2_h264_dpb_entry *dpb = &decode->dpb[i];
> struct cedrus_buffer *cedrus_buf;
> - int buf_idx;
> + struct vb2_buffer *buf;
>
> if (!(dpb->flags & V4L2_H264_DPB_ENTRY_FLAG_VALID))
> continue;
>
> - buf_idx = vb2_find_timestamp(cap_q, dpb->reference_ts, 0);
> - if (buf_idx < 0)
> + buf = vb2_find_buffer(cap_q, dpb->reference_ts);
> + if (!buf)
> continue;
>
> - cedrus_buf = vb2_to_cedrus_buffer(cap_q->bufs[buf_idx]);
> + cedrus_buf = vb2_to_cedrus_buffer(buf);
> position = cedrus_buf->codec.h264.position;
> used_dpbs |= BIT(position);
>
> @@ -186,7 +186,7 @@ static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
> const struct v4l2_h264_dpb_entry *dpb;
> const struct cedrus_buffer *cedrus_buf;
> unsigned int position;
> - int buf_idx;
> + struct vb2_buffer *buf;
> u8 dpb_idx;
>
> dpb_idx = ref_list[i].index;
> @@ -195,11 +195,11 @@ static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
> if (!(dpb->flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
> continue;
>
> - buf_idx = vb2_find_timestamp(cap_q, dpb->reference_ts, 0);
> - if (buf_idx < 0)
> + buf = vb2_find_buffer(cap_q, dpb->reference_ts);
> + if (!buf)
> continue;
>
> - cedrus_buf = vb2_to_cedrus_buffer(cap_q->bufs[buf_idx]);
> + cedrus_buf = vb2_to_cedrus_buffer(buf);
> position = cedrus_buf->codec.h264.position;
>
> sram_array[i] |= position << 1;
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> index 44f385be9f6c..60cc13e4d0a9 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h265.c
> @@ -102,14 +102,14 @@ static void cedrus_h265_frame_info_write_single(struct cedrus_ctx *ctx,
> unsigned int index,
> bool field_pic,
> u32 pic_order_cnt[],
> - int buffer_index)
> + struct vb2_buffer *buf)
> {
> struct cedrus_dev *dev = ctx->dev;
> - dma_addr_t dst_luma_addr = cedrus_dst_buf_addr(ctx, buffer_index, 0);
> - dma_addr_t dst_chroma_addr = cedrus_dst_buf_addr(ctx, buffer_index, 1);
> + dma_addr_t dst_luma_addr = cedrus_dst_buf_addr(ctx, buf, 0);
> + dma_addr_t dst_chroma_addr = cedrus_dst_buf_addr(ctx, buf, 1);
> dma_addr_t mv_col_buf_addr[2] = {
> - cedrus_h265_frame_info_mv_col_buf_addr(ctx, buffer_index, 0),
> - cedrus_h265_frame_info_mv_col_buf_addr(ctx, buffer_index,
> + cedrus_h265_frame_info_mv_col_buf_addr(ctx, buf->index, 0),
> + cedrus_h265_frame_info_mv_col_buf_addr(ctx, buf->index,
> field_pic ? 1 : 0)
Previously, -1 would be passed to cedrus_h265_frame_info_mv_col_buf_addr(),
which would not find a buffer at that index, and would return 0. Now the code
will crash with a NULL pointer deref.
> };
> u32 offset = VE_DEC_H265_SRAM_OFFSET_FRAME_INFO +
> @@ -141,7 +141,7 @@ static void cedrus_h265_frame_info_write_dpb(struct cedrus_ctx *ctx,
> unsigned int i;
>
> for (i = 0; i < num_active_dpb_entries; i++) {
> - int buffer_index = vb2_find_timestamp(vq, dpb[i].timestamp, 0);
> + struct vb2_buffer *buf = vb2_find_buffer(vq, dpb[i].timestamp);
> u32 pic_order_cnt[2] = {
> dpb[i].pic_order_cnt[0],
> dpb[i].pic_order_cnt[1]
> @@ -149,7 +149,7 @@ static void cedrus_h265_frame_info_write_dpb(struct cedrus_ctx *ctx,
>
> cedrus_h265_frame_info_write_single(ctx, i, dpb[i].field_pic,
> pic_order_cnt,
> - buffer_index);
> + buf);
> }
> }
>
> @@ -616,7 +616,7 @@ static void cedrus_h265_setup(struct cedrus_ctx *ctx,
> cedrus_h265_frame_info_write_single(ctx, output_pic_list_index,
> slice_params->pic_struct != 0,
> pic_order_cnt,
> - run->dst->vb2_buf.index);
> + &run->dst->vb2_buf);
>
> cedrus_write(dev, VE_DEC_H265_OUTPUT_FRAME_IDX, output_pic_list_index);
>
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> index 5dad2f296c6d..22d6cae9a710 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_mpeg2.c
> @@ -54,13 +54,9 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
> const struct v4l2_ctrl_mpeg2_picture *pic;
> const struct v4l2_ctrl_mpeg2_quantisation *quantisation;
> dma_addr_t src_buf_addr, dst_luma_addr, dst_chroma_addr;
> - dma_addr_t fwd_luma_addr, fwd_chroma_addr;
> - dma_addr_t bwd_luma_addr, bwd_chroma_addr;
> struct cedrus_dev *dev = ctx->dev;
> struct vb2_queue *vq;
> const u8 *matrix;
> - int forward_idx;
> - int backward_idx;
> unsigned int i;
> u32 reg;
>
> @@ -123,27 +119,19 @@ static void cedrus_mpeg2_setup(struct cedrus_ctx *ctx, struct cedrus_run *run)
> cedrus_write(dev, VE_DEC_MPEG_PICBOUNDSIZE, reg);
>
> /* Forward and backward prediction reference buffers. */
> -
> vq = v4l2_m2m_get_vq(ctx->fh.m2m_ctx, V4L2_BUF_TYPE_VIDEO_CAPTURE);
>
> - forward_idx = vb2_find_timestamp(vq, pic->forward_ref_ts, 0);
> - fwd_luma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 0);
> - fwd_chroma_addr = cedrus_dst_buf_addr(ctx, forward_idx, 1);
> -
> - cedrus_write(dev, VE_DEC_MPEG_FWD_REF_LUMA_ADDR, fwd_luma_addr);
> - cedrus_write(dev, VE_DEC_MPEG_FWD_REF_CHROMA_ADDR, fwd_chroma_addr);
> -
> - backward_idx = vb2_find_timestamp(vq, pic->backward_ref_ts, 0);
> - bwd_luma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 0);
> - bwd_chroma_addr = cedrus_dst_buf_addr(ctx, backward_idx, 1);
> -
> - cedrus_write(dev, VE_DEC_MPEG_BWD_REF_LUMA_ADDR, bwd_luma_addr);
> - cedrus_write(dev, VE_DEC_MPEG_BWD_REF_CHROMA_ADDR, bwd_chroma_addr);
> + cedrus_write_ref_buf_addr(ctx, vq, pic->forward_ref_ts,
> + VE_DEC_MPEG_FWD_REF_LUMA_ADDR,
> + VE_DEC_MPEG_FWD_REF_CHROMA_ADDR);
> + cedrus_write_ref_buf_addr(ctx, vq, pic->backward_ref_ts,
> + VE_DEC_MPEG_BWD_REF_LUMA_ADDR,
> + VE_DEC_MPEG_BWD_REF_CHROMA_ADDR);
>
> /* Destination luma and chroma buffers. */
>
> - dst_luma_addr = cedrus_dst_buf_addr(ctx, run->dst->vb2_buf.index, 0);
> - dst_chroma_addr = cedrus_dst_buf_addr(ctx, run->dst->vb2_buf.index, 1);
> + dst_luma_addr = cedrus_dst_buf_addr(ctx, &run->dst->vb2_buf, 0);
> + dst_chroma_addr = cedrus_dst_buf_addr(ctx, &run->dst->vb2_buf, 1);
>
> cedrus_write(dev, VE_DEC_MPEG_REC_LUMA, dst_luma_addr);
> cedrus_write(dev, VE_DEC_MPEG_REC_CHROMA, dst_chroma_addr);
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c b/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
> index f4016684b32d..196cf692186d 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_vp8.c
> @@ -661,7 +661,6 @@ static void cedrus_vp8_setup(struct cedrus_ctx *ctx,
> dma_addr_t luma_addr, chroma_addr;
> dma_addr_t src_buf_addr;
> int header_size;
> - int qindex;
> u32 reg;
>
> cedrus_engine_enable(ctx, CEDRUS_CODEC_VP8);
> @@ -805,43 +804,17 @@ static void cedrus_vp8_setup(struct cedrus_ctx *ctx,
> reg |= VE_VP8_LF_DELTA0(slice->lf.mb_mode_delta[0]);
> cedrus_write(dev, VE_VP8_MODE_LF_DELTA, reg);
>
> - luma_addr = cedrus_dst_buf_addr(ctx, run->dst->vb2_buf.index, 0);
> - chroma_addr = cedrus_dst_buf_addr(ctx, run->dst->vb2_buf.index, 1);
> + luma_addr = cedrus_dst_buf_addr(ctx, &run->dst->vb2_buf, 0);
> + chroma_addr = cedrus_dst_buf_addr(ctx, &run->dst->vb2_buf, 1);
> cedrus_write(dev, VE_VP8_REC_LUMA, luma_addr);
> cedrus_write(dev, VE_VP8_REC_CHROMA, chroma_addr);
>
> - qindex = vb2_find_timestamp(cap_q, slice->last_frame_ts, 0);
> - if (qindex >= 0) {
> - luma_addr = cedrus_dst_buf_addr(ctx, qindex, 0);
> - chroma_addr = cedrus_dst_buf_addr(ctx, qindex, 1);
> - cedrus_write(dev, VE_VP8_FWD_LUMA, luma_addr);
> - cedrus_write(dev, VE_VP8_FWD_CHROMA, chroma_addr);
> - } else {
> - cedrus_write(dev, VE_VP8_FWD_LUMA, 0);
> - cedrus_write(dev, VE_VP8_FWD_CHROMA, 0);
> - }
> -
> - qindex = vb2_find_timestamp(cap_q, slice->golden_frame_ts, 0);
> - if (qindex >= 0) {
> - luma_addr = cedrus_dst_buf_addr(ctx, qindex, 0);
> - chroma_addr = cedrus_dst_buf_addr(ctx, qindex, 1);
> - cedrus_write(dev, VE_VP8_BWD_LUMA, luma_addr);
> - cedrus_write(dev, VE_VP8_BWD_CHROMA, chroma_addr);
> - } else {
> - cedrus_write(dev, VE_VP8_BWD_LUMA, 0);
> - cedrus_write(dev, VE_VP8_BWD_CHROMA, 0);
> - }
> -
> - qindex = vb2_find_timestamp(cap_q, slice->alt_frame_ts, 0);
> - if (qindex >= 0) {
> - luma_addr = cedrus_dst_buf_addr(ctx, qindex, 0);
> - chroma_addr = cedrus_dst_buf_addr(ctx, qindex, 1);
> - cedrus_write(dev, VE_VP8_ALT_LUMA, luma_addr);
> - cedrus_write(dev, VE_VP8_ALT_CHROMA, chroma_addr);
> - } else {
> - cedrus_write(dev, VE_VP8_ALT_LUMA, 0);
> - cedrus_write(dev, VE_VP8_ALT_CHROMA, 0);
> - }
> + cedrus_write_ref_buf_addr(ctx, cap_q, slice->last_frame_ts,
> + VE_VP8_FWD_LUMA, VE_VP8_FWD_CHROMA);
> + cedrus_write_ref_buf_addr(ctx, cap_q, slice->golden_frame_ts,
> + VE_VP8_BWD_LUMA, VE_VP8_BWD_CHROMA);
> + cedrus_write_ref_buf_addr(ctx, cap_q, slice->alt_frame_ts,
> + VE_VP8_ALT_LUMA, VE_VP8_ALT_CHROMA);
>
> cedrus_write(dev, VE_H264_CTRL, VE_H264_CTRL_VP8 |
> VE_H264_CTRL_DECODE_ERR_INT |
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