Fixes: crash
Fixes: check_pkt.mp4

Found-by: Rafael Dutra <rafael.du...@cispa.de>
Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavcodec/h264_slice.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/libavcodec/h264_slice.c b/libavcodec/h264_slice.c
index 14b945756b..910d8b8848 100644
--- a/libavcodec/h264_slice.c
+++ b/libavcodec/h264_slice.c
@@ -304,9 +304,8 @@ int ff_h264_update_thread_context(AVCodecContext *dst,
     if (dst == src)
         return 0;
 
-    // We can't fail if SPS isn't set at it breaks current skip_frame code
-    //if (!h1->ps.sps)
-    //    return AVERROR_INVALIDDATA;
+    if (inited && !h1->ps.sps)
+        return AVERROR_INVALIDDATA;
 
     if (inited &&
         (h->width                 != h1->width                 ||
-- 
2.17.1

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