* [FFmpeg-devel] [PR] avformat/matroskadec: Check that end_time_ns >= start_time_ns (PR #22270)
@ 2026-02-23 21:03 michaelni via ffmpeg-devel
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From: michaelni via ffmpeg-devel @ 2026-02-23 21:03 UTC (permalink / raw)
To: ffmpeg-devel; +Cc: michaelni
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 <michael@niedermayer.cc>
>From 2f26fd7a1724d89ec2590c7a636ba3ad8812084b Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
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 <michael@niedermayer.cc>
---
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
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2026-02-23 21:03 [FFmpeg-devel] [PR] avformat/matroskadec: Check that end_time_ns >= start_time_ns (PR #22270) michaelni via ffmpeg-devel
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