From: michaelni via ffmpeg-devel <ffmpeg-devel@ffmpeg.org>
To: ffmpeg-devel@ffmpeg.org
Cc: michaelni <code@ffmpeg.org>
Subject: [FFmpeg-devel] [PR] avcodec/hevc/ps: Check bit_depth_cm in/out relation (PR #21783)
Date: Wed, 18 Feb 2026 12:49:46 -0000
Message-ID: <177141898674.25.407871778758215503@29965ddac10e> (raw)
PR #21783 opened by michaelni
URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21783
Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21783.patch
Fixes: Assertion n>0 && n<=25 failed at ./libavcodec/get_bits.h:3
Fixes: 472463689/clusterfuzz-testcase-minimized-ffmpeg_dem_HXVS_fuzzer-6012944883449856
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
>From 380104efd0590f7447958d9d4038c7a47efeea6f Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Mon, 16 Feb 2026 01:38:53 +0100
Subject: [PATCH] avcodec/hevc/ps: Check bit_depth_cm in/out relation
Fixes: Assertion n>0 && n<=25 failed at ./libavcodec/get_bits.h:3
Fixes: 472463689/clusterfuzz-testcase-minimized-ffmpeg_dem_HXVS_fuzzer-6012944883449856
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
libavcodec/hevc/ps.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/libavcodec/hevc/ps.c b/libavcodec/hevc/ps.c
index 9f7a61e794..46b38564d5 100644
--- a/libavcodec/hevc/ps.c
+++ b/libavcodec/hevc/ps.c
@@ -1826,6 +1826,10 @@ static int colour_mapping_table(GetBitContext *gb, AVCodecContext *avctx, HEVCPP
pps->luma_bit_depth_cm_output = get_ue_golomb(gb) + 8;
pps->chroma_bit_depth_cm_output = get_ue_golomb(gb) + 8;
+ if ( pps-> luma_bit_depth_cm_output < pps-> luma_bit_depth_cm_input
+ || pps->chroma_bit_depth_cm_output < pps->chroma_bit_depth_cm_input)
+ return AVERROR_INVALIDDATA;
+
pps->cm_res_quant_bits = get_bits(gb, 2);
pps->cm_delta_flc_bits = get_bits(gb, 2) + 1;
--
2.52.0
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