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avformat/mvdec: Check for EOF in read_index() 

Fixes: Timeout
Fixes: 29550/clusterfuzz-testcase-minimized-ffmpeg_dem_MV_fuzzer-5094307193290752

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 6c64351bb1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-31 16:19:42 +01:00
parent b290a54e5f
commit 2b79229316
1 changed files with 2 additions and 0 deletions
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2
libavformat/mvdec.c
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@ -267,6 +267,8 @@ static void read_index(AVIOContext *pb, AVStream *st)
uint32_t pos = avio_rb32(pb);
uint32_t size = avio_rb32(pb);
avio_skip(pb, 8);
if (avio_feof(pb))
return ;
av_add_index_entry(st, pos, timestamp, size, 0, AVINDEX_KEYFRAME);
if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
timestamp += size / (st->codecpar->channels * 2LL);