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avcodec/vp3: Check that theora is theora

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Theora is forced to be non zero if it is zero and a sample
is asked for, as suggested by reimar

Fixes: Timeout (2min -> 600ms)
Fixes: 15366/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THEORA_fuzzer-5737849938247680

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 2019-07-22 00:41:06 +02:00
parent 11f99a9a45
commit b4bf7226af
1 changed files with 4 additions and 0 deletions
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4
libavcodec/vp3.c
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@ -2957,6 +2957,10 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
s->theora_header = 0;
s->theora = get_bits_long(gb, 24);
av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);
if (!s->theora) {
s->theora = 1;
avpriv_request_sample(s->avctx, "theora 0");
}
/* 3.2.0 aka alpha3 has the same frame orientation as original vp3
* but previous versions have the image flipped relative to vp3 */