Merge commit '074c769de93bf12e9f44d77e58a8c7167f9dfb13'

* commit '074c769de93bf12e9f44d77e58a8c7167f9dfb13':
  h264_cavlc: check the size of the intra PCM data.

This check is redundant, but does no harm

Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/h264_cavlc.c

@@ -773,6 +773,10 @@ decode_intra_mb:
 
         // We assume these blocks are very rare so we do not optimize it.
         h->intra_pcm_ptr = align_get_bits(&h->gb);
+        if (get_bits_left(&h->gb) < mb_size) {
+            av_log(h->avctx, AV_LOG_ERROR, "Not enough data for an intra PCM block.\n");
+            return AVERROR_INVALIDDATA;
+        }
         skip_bits_long(&h->gb, mb_size);
 
         // In deblocking, the quantizer is 0