[FFmpeg-devel] [PATCH 01/10] avformat/concatdec: Check user_duration sum

From: Michael Niedermayer <michael@niedermayer.cc>
To: FFmpeg development discussions and patches <ffmpeg-devel@ffmpeg.org>
Subject: [FFmpeg-devel] [PATCH 01/10] avformat/concatdec: Check user_duration sum
Date: Tue, 26 Mar 2024 01:11:42 +0100
Message-ID: <20240326001151.12083-1-michael@niedermayer.cc> (raw)

Fixes: 62276/clusterfuzz-testcase-minimized-ffmpeg_dem_CONCAT_fuzzer-6434245599690752
Fixes: signed integer overflow: 9223372026773000000 + 22337000000 cannot be represented in type 'long'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/concatdec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index ac541a592fa..f1401e43530 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -679,6 +679,8 @@ static int concat_read_header(AVFormatContext *avf)
             cat->files[i].user_duration = cat->files[i].outpoint - cat->files[i].inpoint;
         }
         cat->files[i].duration = cat->files[i].user_duration;
+        if (time + (uint64_t)cat->files[i].user_duration > INT64_MAX)
+            return AVERROR_INVALIDDATA;
         time += cat->files[i].user_duration;
     }
     if (i == cat->nb_files) {
-- 
2.17.1

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