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avformat/thp: Check compcount

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Fixes: out of array access
Fixes: 22520/clusterfuzz-testcase-minimized-ffmpeg_DEMUXER_fuzzer-5100297658826752

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-05-31 14:24:04 +02:00
parent 6d96bae9c4
commit 1ba8484559
1 changed files with 3 additions and 0 deletions
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3
libavformat/thp.c
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@ -93,6 +93,9 @@ static int thp_read_header(AVFormatContext *s)
avio_seek (pb, thp->compoff, SEEK_SET); avio_seek (pb, thp->compoff, SEEK_SET);
thp->compcount = avio_rb32(pb); thp->compcount = avio_rb32(pb);
if (thp->compcount > FF_ARRAY_ELEMS(thp->components))
return AVERROR_INVALIDDATA;
/* Read the list of component types. */ /* Read the list of component types. */
avio_read(pb, thp->components, 16); avio_read(pb, thp->components, 16);