It will be set when needed if the slice header is decoded successfully.
Prevents the NAL_DPC code from assuming the slice header was decoded
when it was not, leading to invalid reads.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC:[email protected]
---
 libavcodec/h264.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index 07a93cf..a7355ac 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -3338,6 +3338,8 @@ static int decode_slice_header(H264Context *h, 
H264Context *h0)
     int needs_reinit = 0;
     int field_pic_flag, bottom_field_flag;
 
+    h->data_partitioning = 0;
+
     h->me.qpel_put = h->h264qpel.put_h264_qpel_pixels_tab;
     h->me.qpel_avg = h->h264qpel.avg_h264_qpel_pixels_tab;
 
-- 
1.7.10.4

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