[FFmpeg-cvslog] avcodec/vp9: Check in decode_tiles() if there is data remaining

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Aug  4 22:21:02 2018 +0200| [78862488f85207633f29f5a66e42364024a14c3f] | committer: Michael Niedermayer

avcodec/vp9: Check in decode_tiles() if there is data remaining

Fixes: Timeout
Fixes: 9330/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP9_fuzzer-5707345857347584
Fixes: 9775/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_VP9_fuzzer-5643845344690176

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=78862488f85207633f29f5a66e42364024a14c3f
---

 libavcodec/vp9.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/vp9.c b/libavcodec/vp9.c
index b1178c9c0c..acf3ffc9e7 100644
--- a/libavcodec/vp9.c
+++ b/libavcodec/vp9.c
@@ -1306,6 +1306,9 @@ static int decode_tiles(AVCodecContext *avctx,
                         decode_sb_mem(td, row, col, lflvl_ptr,
                                       yoff2, uvoff2, BL_64X64);
                     } else {
+                        if (vpX_rac_is_end(td->c)) {
+                            return AVERROR_INVALIDDATA;
+                        }
                         decode_sb(td, row, col, lflvl_ptr,
                                   yoff2, uvoff2, BL_64X64);
                     }