PR #21666 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21666 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/21666.patch
Fixes: read of uninitialized memory Fixes: 476177761/clusterfuzz-testcase-minimized-ffmpeg_dem_H264_fuzzer-6400884824408064 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> >From 78486d79d0bf8051ed8d909df8568a20e4f05b24 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer <[email protected]> Date: Fri, 6 Feb 2026 22:05:06 +0100 Subject: [PATCH] avcodec/h264_parser: Check remaining input length in loop in scan_mmco_reset() Fixes: read of uninitialized memory Fixes: 476177761/clusterfuzz-testcase-minimized-ffmpeg_dem_H264_fuzzer-6400884824408064 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <[email protected]> --- libavcodec/h264_parser.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/h264_parser.c b/libavcodec/h264_parser.c index 040739a1d4..a217a0dfe4 100644 --- a/libavcodec/h264_parser.c +++ b/libavcodec/h264_parser.c @@ -225,6 +225,9 @@ static int scan_mmco_reset(AVCodecParserContext *s, GetBitContext *gb, if (get_bits1(gb)) { // adaptive_ref_pic_marking_mode_flag int i; for (i = 0; i < H264_MAX_MMCO_COUNT; i++) { + if (get_bits_left(gb) < 1) + return AVERROR_INVALIDDATA; + MMCOOpcode opcode = get_ue_golomb_31(gb); if (opcode > (unsigned) MMCO_LONG) { av_log(logctx, AV_LOG_ERROR, -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- [email protected] To unsubscribe send an email to [email protected]
