From 3295d22f3ab197ac872603b38da535d33b971708 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Wed, 8 Feb 2017 17:55:41 +0100
Subject: [PATCH] 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@niedermayer.cc>
(cherry picked from commit c03029a835949fc0e68b4c6558ebcdc3ae137087)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavcodec/h264.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index b979b15382..550a7fc15e 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -1591,7 +1591,9 @@ again:
 #endif
                     } else
                         context_count++;
-                }
+                } else
+                    sl->ref_count[0] = sl->ref_count[1] = 0;
+            break;
                 break;
             case NAL_DPA:
             case NAL_DPB: