[FFmpeg-devel] [PATCH 2/2] avformat/mvdec: Use 64 bit in timestamp computation

[Michael Niedermayer]

Fixes: division by zero
Fixes: 42198/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5054366405492736.fuzz
Fixes: 42222/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-4561249331970048

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 8b54a9ab045..5d184f20a49 100644
--- a/libavformat/mvdec.c
+++ b/libavformat/mvdec.c
@@ -381,7 +381,7 @@ 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 * bytes_per_sample);
+            timestamp += asize / (ast->codecpar->channels * (uint64_t)bytes_per_sample);
         }
     } else if (!version && avio_rb16(pb) == 3) {
         avio_skip(pb, 4);
-- 
2.17.1