Index: sys/net/rtsock.c
===================================================================
--- sys/net/rtsock.c	(revision 335757)
+++ sys/net/rtsock.c	(working copy)
@@ -1556,10 +1556,13 @@ sysctl_dumpentry(struct radix_node *rn, 
 	    rt_mask(rt), &ss);
 	info.rti_info[RTAX_GENMASK] = 0;
 	if (rt->rt_ifp) {
-		info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
+		IF_ADDR_RLOCK(rt->rt_ifp);
+		if (rt->rt_ifp->if_addr != NULL)
+			info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
 		info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
 		if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
 			info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
+		IF_ADDR_RUNLOCK(rt->rt_ifp);
 	}
 	if ((error = rtsock_msg_buffer(RTM_GET, &info, w, &size)) != 0)
 		return (error);