[FFmpeg-devel] [PATCH 2/2] avcodec/vp3: Check that theora is theora

[Michael Niedermayer]

Fixes: Timeout (2min -> 100ms)
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 at niedermayer.cc>
---
 libavcodec/vp3.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index a6f759ebf5..8a165c1275 100644
--- a/libavcodec/vp3.c
+++ b/libavcodec/vp3.c
@@ -2957,6 +2957,8 @@ 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)
+        return AVERROR_INVALIDDATA;
 
     /* 3.2.0 aka alpha3 has the same frame orientation as original vp3
      * but previous versions have the image flipped relative to vp3 */
-- 
2.22.0