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avformat/moflex: Check m->size before seeking

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Fixes: Infinite loop
Fixes: 26016/clusterfuzz-testcase-minimized-ffmpeg_IO_DEMUXER_fuzzer-6195663833137152

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-10-02 14:59:15 +02:00
parent 3291d994b7
commit acd735efaf
1 changed files with 4 additions and 1 deletions
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5
libavformat/moflex.c
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@ -342,8 +342,11 @@ static int moflex_read_packet(AVFormatContext *s, AVPacket *pkt)
m->in_block = 0;
if (m->flags % 2 == 0)
if (m->flags % 2 == 0) {
if (m->size <= 0)
return AVERROR_INVALIDDATA;
avio_seek(pb, m->pos + m->size, SEEK_SET);
}
}
return AVERROR_EOF;