From 99b2700f5bf887cf95316a2f9e8c1082b11982ba Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Wed, 15 Dec 2021 18:37:13 +0100 Subject: [PATCH] avformat/mvdec: Use 64 bit in timestamp computation 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 Reviewed-by: Peter Ross Signed-off-by: Michael Niedermayer --- libavformat/mvdec.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/libavformat/mvdec.c b/libavformat/mvdec.c index 8b54a9ab04..5d184f20a4 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);