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Fri, 6 Feb 2026 23:42:44 +0200 (EET) MIME-Version: 1.0 To: ffmpeg-devel@ffmpeg.org Date: Fri, 06 Feb 2026 21:42:44 -0000 Message-ID: <177041416452.25.8139496405357691466@4457048688e7> Message-ID-Hash: OBH2M3G45CPMUOTL6DYYS2UJW4RP22YK X-Message-ID-Hash: OBH2M3G45CPMUOTL6DYYS2UJW4RP22YK X-MailFrom: code@ffmpeg.org X-Mailman-Rule-Hits: nonmember-moderation X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; loop; banned-address; header-match-ffmpeg-devel.ffmpeg.org-0; header-match-ffmpeg-devel.ffmpeg.org-1; header-match-ffmpeg-devel.ffmpeg.org-2; header-match-ffmpeg-devel.ffmpeg.org-3; emergency; member-moderation X-Mailman-Version: 3.3.10 Precedence: list Reply-To: FFmpeg development discussions and patches Subject: [FFmpeg-devel] [PR] avcodec/h264_parser: Check remaining input length in loop in scan_mmco_reset() (PR #21666) List-Id: FFmpeg development discussions and patches Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: From: michaelni via ffmpeg-devel Cc: michaelni Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Archived-At: List-Archive: List-Post: 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 >>From 78486d79d0bf8051ed8d909df8568a20e4f05b24 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer 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 --- 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 -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org