diff -up dhcp-4.2.2/common/lpf.c.orig dhcp-4.2.2/common/lpf.c
--- dhcp-4.2.2/common/lpf.c.orig	2011-09-19 11:18:09.000000000 +0200
+++ dhcp-4.2.2/common/lpf.c	2011-09-19 11:18:26.371540946 +0200
@@ -602,6 +602,8 @@ static unsigned char * get_ib_hw_addr(ch
 		return NULL;
 
 	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
+		if (ifa->ifa_addr == NULL)
+			continue;
 		if (ifa->ifa_addr->sa_family != AF_PACKET)
 			continue;
 		if (ifa->ifa_flags & IFF_LOOPBACK)
@@ -635,6 +637,9 @@ get_hw_addr(struct interface_info *info)
 
 	for (ifa = ifaddrs; ifa != NULL; ifa = ifa->ifa_next) {
 
+		if (ifa->ifa_addr == NULL)
+			continue;
+
 		if (ifa->ifa_addr->sa_family != AF_PACKET)
 			continue;