Ticket #519: patch_audio

Index: mpegaudiodec.c
===================================================================
--- mpegaudiodec.c      (revision 13)
+++ mpegaudiodec.c      (working copy)
@@ -1650,8 +1650,12 @@
             if (get_bits_count(&s->gb) >= end_pos)
                 break;
             if (code_table) {
+                const HuffTable *h = &mpa_huff_tables[l];
+                int size = h -> xsize;
+
+                size = size * size;
                 code = get_vlc2(&s->gb, vlc->table, 8, 2);
-                if (code < 0)
+                if (code < 0 || code >= size)
                     return -1;
                 y = code_table[code];
                 x = y >> 4;