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avformat/vqf: Check len for COMM chunks 

Fixes: Infinite loop
Fixes: 26696/clusterfuzz-testcase-minimized-ffmpeg_dem_VQF_fuzzer-5648269168082944

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 a834af133b)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-11-01 20:20:02 +01:00
parent c1f7a4153e
commit 6acd99576b
1 changed files with 3 additions and 0 deletions
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3
libavformat/vqf.c
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@ -132,6 +132,9 @@ static int vqf_read_header(AVFormatContext *s)
switch(chunk_tag){
case MKTAG('C','O','M','M'):
if (len < 12)
return AVERROR_INVALIDDATA;
avio_read(s->pb, comm_chunk, 12);
st->codecpar->channels = AV_RB32(comm_chunk ) + 1;
read_bitrate = AV_RB32(comm_chunk + 4);