[FFmpeg-devel] [PATCH 09/10] avformat/matroskadec: Check timescale

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 09/10] avformat/matroskadec: Check timescale
Date: Tue, 26 Mar 2024 01:11:50 +0100
Message-ID: <20240326001151.12083-9-michael@niedermayer.cc> (raw)
In-Reply-To: <20240326001151.12083-1-michael@niedermayer.cc>

Fixes: 3.82046e+18 is outside the range of representable values of type 'unsigned int'
Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_WEBM_DASH_MANIFEST_fuzzer-6381436594421760

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 8897fd622c6..8e031c618ba 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3195,6 +3195,10 @@ static int matroska_parse_tracks(AVFormatContext *s)
                    track->time_scale);
             track->time_scale = 1.0;
         }
+
+        if (matroska->time_scale * track->time_scale > UINT_MAX)
+            return AVERROR_INVALIDDATA;
+
         avpriv_set_pts_info(st, 64, matroska->time_scale * track->time_scale,
                             1000 * 1000 * 1000);    /* 64 bit pts in ns */
 
-- 
2.17.1

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