Merge commit '342c43d1'

* commit '342c43d1':
  omadec: Properly check lengths before incrementing the position

See: f1d6f013Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/omadec.c

@@ -171,7 +171,11 @@ static int nprobe(AVFormatContext *s, uint8_t *enc_header, unsigned size,
     taglen  = AV_RB32(&enc_header[pos + 32]);
     datalen = AV_RB32(&enc_header[pos + 36]) >> 4;
 
-    pos += 44 + taglen;
+    pos += 44;
+    if (size - pos < taglen)
+        return -1;
+
+    pos += taglen;
 
     if (pos + (((uint64_t)datalen) << 4) > size)
         return -1;