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avcodec/cbs_vp9: Check index_size 

Fixes: out of array read
Fixes: 19300/clusterfuzz-testcase-minimized-ffmpeg_BSF_VP9_METADATA_fuzzer-5653911730126848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-14 00:27:09 +01:00
parent 3dd6c4478b
commit d6553e2e60
1 changed files with 3 additions and 0 deletions
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3
libavcodec/cbs_vp9.c
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@ -428,6 +428,9 @@ static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx,
index_size = 2 + (((superframe_header & 0x18) >> 3) + 1) *
((superframe_header & 0x07) + 1);
if (index_size > frag->data_size)
return AVERROR_INVALIDDATA;
err = init_get_bits(&gbc, frag->data + frag->data_size - index_size,
8 * index_size);
if (err < 0)