---
 libavcodec/mdec.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/libavcodec/mdec.c b/libavcodec/mdec.c
index 545b919..9b6e6b6 100644
--- a/libavcodec/mdec.c
+++ b/libavcodec/mdec.c
@@ -125,7 +125,8 @@ static inline int decode_mb(MDECContext *a, DCTELEM 
block[6][64]){
     a->dsp.clear_blocks(block[0]);
 
     for(i=0; i<6; i++){
-        if( mdec_decode_block_intra(a, block[ block_index[i] ], 
block_index[i]) < 0)
+        if( mdec_decode_block_intra(a, block[ block_index[i] ], 
block_index[i]) < 0 ||
+            get_bits_left(&a->gb) < 0)
             return -1;
     }
     return 0;
-- 
1.7.4.4

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