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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] avformat/matroskadec: Check that end_time_ns >= start_time_ns (PR #22270) 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 #22270 opened by michaelni URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22270 Patch URL: https://code.ffmpeg.org/FFmpeg/FFmpeg/pulls/22270.patch Fixes: signed integer overflow: -8659510451449931520 - 2205846422852077376 cannot be represented in type 'int64_t' (aka 'long') Fixes: 486358507/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-4896911086911488 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer >>From 2f26fd7a1724d89ec2590c7a636ba3ad8812084b Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Mon, 23 Feb 2026 19:52:18 +0100 Subject: [PATCH] avformat/matroskadec: Check that end_time_ns >= start_time_ns Fixes: signed integer overflow: -8659510451449931520 - 2205846422852077376 cannot be represented in type 'int64_t' (aka 'long') Fixes: 486358507/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-4896911086911488 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer --- libavformat/matroskadec.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c index 503b99b286..aa7a2d1785 100644 --- a/libavformat/matroskadec.c +++ b/libavformat/matroskadec.c @@ -4454,6 +4454,10 @@ static CueDesc get_cue_desc(AVFormatContext *s, int64_t ts, int64_t cues_start) // Clusters. cue_desc.end_offset = cues_start - matroska->segment_start; } + + if (cue_desc.end_time_ns < cue_desc.start_time_ns) + return (CueDesc) {-1, -1, -1, -1}; + return cue_desc; } -- 2.52.0 _______________________________________________ ffmpeg-devel mailing list -- ffmpeg-devel@ffmpeg.org To unsubscribe send an email to ffmpeg-devel-leave@ffmpeg.org