ffmpeg | branch: master | Michael Niedermayer <michael@niedermayer.cc> | Sat Jan 30 00:46:26 2021 +0100| [869fe41d1088c4badcd98ee1ca2490451a07b173] | committer: Michael Niedermayer avcodec/vp3: Check input amount in theora_decode_header() 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>

http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=869fe41d1088c4badc...

libavcodec/vp3.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c index 2a1da6b062..57c6eb1ff9 100644 --- a/libavcodec/vp3.c +++ b/libavcodec/vp3.c @@ -2875,6 +2875,9 @@ 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(gb, 24); av_log(avctx, AV_LOG_DEBUG, "Theora bitstream version %X\n", s->theora);