[FFmpeg-cvslog] avcodec/cllc: Check bitstream end before decoding pixels

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Wed May 24 19:52:00 2017 +0200| [cfec0d64752509f8ac798acca6225df630fa5284] | committer: Michael Niedermayer

avcodec/cllc: Check bitstream end before decoding pixels

Fixes timeout
Fixes: 1802/clusterfuzz-testcase-minimized-5008293510512640

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=cfec0d64752509f8ac798acca6225df630fa5284
---

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

diff --git a/libavcodec/cllc.c b/libavcodec/cllc.c
index 933144ae81..af0f6da2e9 100644
--- a/libavcodec/cllc.c
+++ b/libavcodec/cllc.c
@@ -429,6 +429,9 @@ static int cllc_decode_frame(AVCodecContext *avctx, void *data,
     coding_type = (AV_RL32(src) >> 8) & 0xFF;
     av_log(avctx, AV_LOG_DEBUG, "Frame coding type: %d\n", coding_type);
 
+    if(get_bits_left(&gb) < avctx->height * avctx->width)
+        return AVERROR_INVALIDDATA;
+
     switch (coding_type) {
     case 0:
         avctx->pix_fmt             = AV_PIX_FMT_YUV422P;