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avcodec/cbs_vp9: Check data_size 

Fixes: out of array access
Fixes: 19542/clusterfuzz-testcase-minimized-ffmpeg_BSF_TRACE_HEADERS_fuzzer-5659498341728256

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>
(cherry picked from commit 4fa2d5a692)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-12-26 00:57:07 +01:00
parent 98e15ff21b
commit 780e8ac273
1 changed files with 3 additions and 0 deletions
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3
libavcodec/cbs_vp9.c
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@ -416,6 +416,9 @@ static int cbs_vp9_split_fragment(CodedBitstreamContext *ctx,
uint8_t superframe_header;
int err;
if (frag->data_size == 0)
return AVERROR_INVALIDDATA;
// Last byte in the packet.
superframe_header = frag->data[frag->data_size - 1];