The code is only called if size is > 0 so buf should not be NULL

Helps: CID610554

Signed-off-by: Michael Niedermayer <mich...@niedermayer.cc>
---
 libavformat/matroskadec.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 4715f1b7d4..de73f97aca 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -3701,6 +3701,8 @@ static int matroska_parse_block(MatroskaDemuxContext 
*matroska, AVBufferRef *buf
     uint64_t num;
     int trust_default_duration;
 
+    av_assert1(buf);
+
     ffio_init_context(&pb, data, size, 0, NULL, NULL, NULL, NULL);
 
     if ((n = ebml_read_num(matroska, &pb.pub, 8, &num, 1)) < 0)
-- 
2.17.1

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