[FFmpeg-cvslog] avcodec/arbc: Skip unchanged frames

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sun Apr 14 11:03:06 2019 +0200| [8b10f09fd537aa1d8d775a04f3f294c30986ab07] | committer: Michael Niedermayer

avcodec/arbc: Skip unchanged frames

Fixes: Timeout (16sec -> 5sec)
Fixes: 14128/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ARBC_fuzzer-5767365721063424

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=8b10f09fd537aa1d8d775a04f3f294c30986ab07
---

 libavcodec/arbc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/arbc.c b/libavcodec/arbc.c
index a8b0bb0d8b..08d3a0ae6b 100644
--- a/libavcodec/arbc.c
+++ b/libavcodec/arbc.c
@@ -121,7 +121,7 @@ static int decode_frame(AVCodecContext *avctx, void *data,
     bytestream2_skip(&s->gb, 8);
     nb_segments = bytestream2_get_le16(&s->gb);
     if (nb_segments == 0)
-        keyframe = 0;
+        return avpkt->size;
 
     if (7 * nb_segments > bytestream2_get_bytes_left(&s->gb))
         return AVERROR_INVALIDDATA;