[FFmpeg-cvslog] avcodec/h264_slice: Clear ref_counts on redundant slices

[Michael Niedermayer]

ffmpeg | branch: release/2.8 | Michael Niedermayer <michael at niedermayer.cc> | Wed Feb  8 17:55:41 2017 +0100| [912cb27f73d8d08ef4fb882f434ff8ea7cc15a81] | committer: Michael Niedermayer

avcodec/h264_slice: Clear ref_counts on redundant slices

Fixes reading freed memory
Fixes: 568/clusterfuzz-testcase-6107186067406848

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit c03029a835949fc0e68b4c6558ebcdc3ae137087)
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=912cb27f73d8d08ef4fb882f434ff8ea7cc15a81
---

 libavcodec/h264.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index fead5ae..4fc2aed 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1587,7 +1587,9 @@ again:
 #endif
                     } else
                         context_count++;
-                }
+                } else
+                    sl->ref_count[0] = sl->ref_count[1] = 0;
+            break;
                 break;
             case NAL_DPA:
             case NAL_DPB: