From 796b5c6d4f1615d59d5d8fe5a38fae6bfdfe878e Mon Sep 17 00:00:00 2001 From: Michael Bommarito Date: Wed, 27 May 2026 15:47:36 -0400 Subject: [PATCH] media: v4l2-ctrls: validate HEVC EXT SPS RPS counts The HEVC SPS control carries the short-term and long-term RPS counts that decoder drivers use to walk the matching EXT SPS dynamic arrays. Reject SPS values that exceed the HEVC limits of 64 short-term sets and 32 long-term references so drivers cannot later index beyond those controls. Also reject EXT SPS ST RPS entries whose negative or positive picture counts exceed the 16-entry arrays, or whose combined delta-POC count exceeds the HEVC DPB maximum. Fixes: c9a59dc2acc7 ("media: rkvdec: Add HEVC support for the VDPU381 variant") Cc: stable@vger.kernel.org Suggested-by: Detlev Casanova Assisted-by: Claude:claude-opus-4-7 Signed-off-by: Michael Bommarito Reviewed-by: Nicolas Dufresne Signed-off-by: Nicolas Dufresne Signed-off-by: Hans Verkuil --- drivers/media/v4l2-core/v4l2-ctrls-core.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c index ba047d7d8601..1214e7744ac0 100644 --- a/drivers/media/v4l2-core/v4l2-ctrls-core.c +++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c @@ -16,6 +16,9 @@ static const union v4l2_ctrl_ptr ptr_null; +#define V4L2_HEVC_MAX_SHORT_TERM_REF_PIC_SETS 64 +#define V4L2_HEVC_MAX_LONG_TERM_REF_PICS_SPS 32 + static void fill_event(struct v4l2_event *ev, struct v4l2_ctrl *ctrl, u32 changes) { @@ -1214,6 +1217,10 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx, case V4L2_CTRL_TYPE_HEVC_SPS: p_hevc_sps = p; + if (p_hevc_sps->num_short_term_ref_pic_sets > + V4L2_HEVC_MAX_SHORT_TERM_REF_PIC_SETS) + return -EINVAL; + if (!(p_hevc_sps->flags & V4L2_HEVC_SPS_FLAG_PCM_ENABLED)) { p_hevc_sps->pcm_sample_bit_depth_luma_minus1 = 0; p_hevc_sps->pcm_sample_bit_depth_chroma_minus1 = 0; @@ -1224,6 +1231,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx, if (!(p_hevc_sps->flags & V4L2_HEVC_SPS_FLAG_LONG_TERM_REF_PICS_PRESENT)) p_hevc_sps->num_long_term_ref_pics_sps = 0; + else if (p_hevc_sps->num_long_term_ref_pics_sps > + V4L2_HEVC_MAX_LONG_TERM_REF_PICS_SPS) + return -EINVAL; break; case V4L2_CTRL_TYPE_HEVC_PPS: @@ -1280,6 +1290,11 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx, if (p_hevc_st_rps->flags & ~V4L2_HEVC_EXT_SPS_ST_RPS_FLAG_INTER_REF_PIC_SET_PRED) return -EINVAL; + if (p_hevc_st_rps->num_negative_pics > 16 || + p_hevc_st_rps->num_positive_pics > 16 || + p_hevc_st_rps->num_negative_pics + + p_hevc_st_rps->num_positive_pics > 16) + return -EINVAL; break; case V4L2_CTRL_TYPE_HEVC_EXT_SPS_LT_RPS: