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If client leaves this field unset and configures an encode with high bitrate, low QP, or any other parameters resulting in high quality encode, then the driver-calculated bitstream buffer size (MIN_BS_SIZE) will be too small resulting in undetermined behavior. Cc: stable@vger.kernel.org Fixes: 88ff31fd0181 ("media: chips-media: wave5: Use helpers to calculate bytesperline and sizeimage.") Signed-off-by: Brandon Brnich --- Current DEFAULT_BS_SIZE is just a placeholder value - I can lower if required so memory consumption doesn't go up drastically if sizeimage is set 0 by user. I saw this was the common equation in rockchip and hantro driver. Link to uAPI requirement: https://docs.kernel.org/userspace-api/media/v4l/pixfmt-v4l2-mplane.html .../media/platform/chips-media/wave5/wave5-helper.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/media/platform/chips-media/wave5/wave5-helper.c b/drivers/media/platform/chips-media/wave5/wave5-helper.c index c3d34be833ff0..384a0a9aac3ae 100644 --- a/drivers/media/platform/chips-media/wave5/wave5-helper.c +++ b/drivers/media/platform/chips-media/wave5/wave5-helper.c @@ -7,7 +7,10 @@ #include "wave5-helper.h" -#define DEFAULT_BS_SIZE(width, height) ((width) * (height) / 8 * 3) +/* Smallest bitstream buffer accepted when the client provides a sizeimage */ +#define MIN_BS_SIZE(width, height) ((width) * (height) * 3 / 8) +/* Worst case: Allocate bitstream buffer size based on resolution and max depth */ +#define DEFAULT_BS_SIZE(width, height) ((width) * (height) * 2) const char *state_to_str(enum vpu_instance_state state) { @@ -261,8 +264,11 @@ void wave5_update_pix_fmt(struct v4l2_pix_format_mplane *pix_mp, pix_mp->height = height; pix_mp->num_planes = 1; pix_mp->plane_fmt[0].bytesperline = 0; - pix_mp->plane_fmt[0].sizeimage = max(DEFAULT_BS_SIZE(width, height), - pix_mp->plane_fmt[0].sizeimage); + if (!pix_mp->plane_fmt[0].sizeimage) + pix_mp->plane_fmt[0].sizeimage = DEFAULT_BS_SIZE(width, height); + else + pix_mp->plane_fmt[0].sizeimage = max(MIN_BS_SIZE(width, height), + pix_mp->plane_fmt[0].sizeimage); } else { v4l2_fill_pixfmt_mp(pix_mp, pix_mp->pixelformat, width, height); } -- 2.43.0