Subject: [PATCH v2 1/3] media: rkvdec: hevc: tighten EXT SPS RPS control dimensions

From: Michael Bommarito <[email-masked]>
Date: Wed, 27 May 2026 15:47:35 -0400

The VDPU381 HEVC driver registers V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS
and V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS with .cfg.dims = { 65 }, but
the HEVC spec caps num_short_term_ref_pic_sets at 64 (ITU-T H.265 7.4.8)
and num_long_term_ref_pics_sps at 32 (7.4.3.2.1). The hardware descriptor
table (struct rkvdec_rps) sizes match those spec limits: refs[32] and
short_term_ref_sets[64].

Reduce the dims to { 64 } and { 32 } respectively so the V4L2 control
framework rejects oversized payloads before any driver code runs.

Fixes: c9a59dc2acc7 ("media: rkvdec: Add HEVC support for the VDPU381 variant")
Cc: [email-masked]
Suggested-by: Detlev Casanova <[email-masked]>
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Michael Bommarito <[email-masked]>
---
 drivers/media/platform/rockchip/rkvdec/rkvdec.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/rockchip/rkvdec/rkvdec.c b/drivers/media/platform/rockchip/rkvdec/rkvdec.c
index 1d1e9bfef8e96..4fd06f4c04db0 100644
--- a/drivers/media/platform/rockchip/rkvdec/rkvdec.c
+++ b/drivers/media/platform/rockchip/rkvdec/rkvdec.c
@@ -278,12 +278,12 @@ static const struct rkvdec_ctrl_desc vdpu38x_hevc_ctrl_descs[] = {
 	{
 		.cfg.id = V4L2_CID_STATELESS_HEVC_EXT_SPS_ST_RPS,
 		.cfg.ops = &rkvdec_ctrl_ops,
-		.cfg.dims = { 65 },
+		.cfg.dims = { 64 },
 	},
 	{
 		.cfg.id = V4L2_CID_STATELESS_HEVC_EXT_SPS_LT_RPS,
 		.cfg.ops = &rkvdec_ctrl_ops,
-		.cfg.dims = { 65 },
+		.cfg.dims = { 32 },
 	},
 };
 
-- 
2.53.0