From 3e7ec8ed402fca35161589100b7de09f23bd21ce Mon Sep 17 00:00:00 2001
From: ume <ume@FreeBSD.org>
Date: Tue, 2 Jan 2001 15:17:19 +0000
Subject: [PATCH] do not touch ra_addr if it is NULL.  from IIJ SEIL team

Obtained from:	KAME
---
 sys/netinet6/in6_prefix.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/sys/netinet6/in6_prefix.c b/sys/netinet6/in6_prefix.c
index b75a72fed1d1..1eaea506bf98 100644
--- a/sys/netinet6/in6_prefix.c
+++ b/sys/netinet6/in6_prefix.c
@@ -603,14 +603,16 @@ add_each_addr(struct socket *so, struct rr_prefix *rpp, struct rp_addr *rap)
 	if (ia6 != NULL) {
 		if (ia6->ia6_ifpr == NULL) {
 			/* link this addr and the prefix each other */
-			IFAFREE(&rap->ra_addr->ia_ifa);
+			if (rap->ra_addr)
+				IFAFREE(&rap->ra_addr->ia_ifa);
 			rap->ra_addr = ia6;
 			rap->ra_addr->ia_ifa.ifa_refcnt++;
 			ia6->ia6_ifpr = rp2ifpr(rpp);
 			return;
 		}
 		if (ia6->ia6_ifpr == rp2ifpr(rpp)) {
-			IFAFREE(&rap->ra_addr->ia_ifa);
+			if (rap->ra_addr)
+				IFAFREE(&rap->ra_addr->ia_ifa);
 			rap->ra_addr = ia6;
 			rap->ra_addr->ia_ifa.ifa_refcnt++;
 			return;