diff -Naur affix-kernel-3.2.0-old/btcore/hci.c affix-kernel-3.2.0/btcore/hci.c
--- affix-kernel-3.2.0-old/btcore/hci.c	2004-07-29 14:44:58.000000000 +0300
+++ affix-kernel-3.2.0/btcore/hci.c	2005-04-22 14:58:33.000000000 +0300
@@ -2148,7 +2148,7 @@
 
 int affix_sock_register(struct net_proto_family *pf, int protocol)
 {
-	if (protocol >= BTPROTO_MAX)
+	if ((protocol <0) || (protocol >= BTPROTO_MAX))
 		return -EINVAL;
 	if (btprotos[protocol])
 		return -EEXIST;
@@ -2169,7 +2169,7 @@
 
 int affix_sock_unregister(int protocol)
 {
-	if (protocol >= BTPROTO_MAX)
+	if ((protocol <0) || (protocol >= BTPROTO_MAX))
 		return -EINVAL;
 	btprotos[protocol] = NULL;
 	return 0;
@@ -2180,7 +2180,7 @@
 	int	i;
 
 	DBFENTER;
-	if (protocol >= BTPROTO_MAX)
+	if ((protocol <0) || (protocol >= BTPROTO_MAX))
 		return -EPROTONOSUPPORT;
 	if (btprotos[protocol] == NULL) {
 		if (protocol == BTPROTO_RFCOMM)