--- a/libpurple/protocols/yahoo/yahoo_packet.c	Wed Mar 25 07:12:28 2009 +0000
+++ b/libpurple/protocols/yahoo/yahoo_packet.c	Thu Mar 26 03:40:59 2009 +0000
@@ -201,6 +201,8 @@
 		}
 		pos += 2;
 
+		if (pos + 1 > len) break;
+
 		/* Skip over garbage we've noticed in the mail notifications */
 		if (data[0] == '9' && data[pos] == 0x01)
 			pos++;