src/libFLAC/stream_decoder.c : Fix buffer read overflow.

This is CVE-2014-8962.

Reported-by: Michele Spagnuolo,
             Google Security Team <mikispag@google.com>
diff --git a/src/libFLAC/stream_decoder.c b/src/libFLAC/stream_decoder.c
index cb66fe2..88a656d 100644
--- a/src/libFLAC/stream_decoder.c
+++ b/src/libFLAC/stream_decoder.c
@@ -71,7 +71,7 @@
  *
  ***********************************************************************/
 
-static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
+static const FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
 
 /***********************************************************************
  *
@@ -1361,6 +1361,10 @@
 			id = 0;
 			continue;
 		}
+
+		if(id >= 3)
+			return false;
+
 		if(x == ID3V2_TAG_[id]) {
 			id++;
 			i = 0;