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Subject[PATCH v1 3/5] media: staging: tegra-vde: Correct minimum size of U/V planes
Date
Stride of U/V planes must be aligned to 16 bytes (2 macroblocks). This
needs to be taken into account, otherwise it is possible to get a silent
memory corruption if dmabuf size is less than the size of decoded video
frame.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/staging/media/tegra-vde/tegra-vde.c | 12 +++++++++---
1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/media/tegra-vde/tegra-vde.c b/drivers/staging/media/tegra-vde/tegra-vde.c
index 14899c887d58..94b4db55cdb5 100644
--- a/drivers/staging/media/tegra-vde/tegra-vde.c
+++ b/drivers/staging/media/tegra-vde/tegra-vde.c
@@ -602,12 +602,12 @@ static int tegra_vde_attach_dmabufs_to_frame(struct device *dev,
struct tegra_vde_h264_frame *src,
enum dma_data_direction dma_dir,
bool baseline_profile,
- size_t csize)
+ size_t lsize, size_t csize)
{
int err;

err = tegra_vde_attach_dmabuf(dev, src->y_fd,
- src->y_offset, csize * 4, SZ_256,
+ src->y_offset, lsize, SZ_256,
&frame->y_dmabuf_attachment,
&frame->y_addr,
&frame->y_sgt,
@@ -773,9 +773,11 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
enum dma_data_direction dma_dir;
dma_addr_t bitstream_data_addr;
dma_addr_t bsev_ptr;
+ size_t lsize, csize;
size_t bitstream_data_size;
unsigned int macroblocks_nb;
unsigned int read_bytes;
+ unsigned int cstride;
unsigned int i;
long timeout;
int ret, err;
@@ -814,6 +816,10 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
goto free_dpb_frames;
}

+ cstride = ALIGN(ctx.pic_width_in_mbs * 8, 16);
+ csize = cstride * ctx.pic_height_in_mbs * 8;
+ lsize = macroblocks_nb * 256;
+
for (i = 0; i < ctx.dpb_frames_nb; i++) {
ret = tegra_vde_validate_frame(dev, &frames[i]);
if (ret)
@@ -827,7 +833,7 @@ static int tegra_vde_ioctl_decode_h264(struct tegra_vde *vde,
ret = tegra_vde_attach_dmabufs_to_frame(dev, &dpb_frames[i],
&frames[i], dma_dir,
ctx.baseline_profile,
- macroblocks_nb * 64);
+ lsize, csize);
if (ret)
goto release_dpb_frames;
}
--
2.16.1
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