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avcodec/vp3: Check input amount in theora_decode_header()

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Fixes: Timeout
Fixes: 29226/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_THEORA_fuzzer-6195092572471296

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 869fe41d10)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-01-30 00:46:26 +01:00
parent 9b43c8d34a
commit cd64495084
1 changed files with 3 additions and 0 deletions
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3
libavcodec/vp3.c
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@ -2273,6 +2273,9 @@ static int theora_decode_header(AVCodecContext *avctx, GetBitContext *gb)
int ret;
AVRational fps, aspect;
if (get_bits_left(gb) < 206)
return AVERROR_INVALIDDATA;
s->theora_header = 0;
s->theora = get_bits_long(gb, 24);
av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);