Fixes invalid writes.

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

diff --git a/libavcodec/rpza.c b/libavcodec/rpza.c
index c859126..54b96b4 100644
--- a/libavcodec/rpza.c
+++ b/libavcodec/rpza.c
@@ -119,6 +119,8 @@ static void rpza_decode_stream(RpzaContext *s)
             }
         }
 
+        n_blocks = FFMIN(n_blocks, total_blocks);
+
         switch (opcode & 0xe0) {
 
         /* Skip blocks */
-- 
1.7.10.4

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