[FFmpeg-devel] [PATCH 1/2] avformat/mvdec: Fix integer overflow with billions of channels
Michael Niedermayer
michael at niedermayer.cc
Tue Jun 23 03:14:57 EEST 2020
Fixes: signed integer overflow: 1394614304 * 2 cannot be represented in type 'int'
Fixes: 23491/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5697377020411904
Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
---
libavformat/mvdec.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c
index 64166a84b1..fa87384c6b 100644
--- a/libavformat/mvdec.c
+++ b/libavformat/mvdec.c
@@ -355,7 +355,7 @@ static int mv_read_header(AVFormatContext *avctx)
avio_skip(pb, 8);
av_add_index_entry(ast, pos, timestamp, asize, 0, AVINDEX_KEYFRAME);
av_add_index_entry(vst, pos + asize, i, vsize, 0, AVINDEX_KEYFRAME);
- timestamp += asize / (ast->codecpar->channels * 2);
+ timestamp += asize / (ast->codecpar->channels * 2LL);
}
} else if (!version && avio_rb16(pb) == 3) {
avio_skip(pb, 4);
--
2.17.1
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