Apply by doing:
	cd /usr/src
	patch -p0 < 004_route.patch

Then build and install a new kernel.

Index: sys/net/rtsock.c
===================================================================
RCS file: /cvs/src/sys/net/rtsock.c,v
retrieving revision 1.123
retrieving revision 1.123.2.1
diff -u -p -r1.123 -r1.123.2.1
--- sys/net/rtsock.c	20 Sep 2012 20:53:13 -0000	1.123
+++ sys/net/rtsock.c	17 May 2013 11:34:49 -0000	1.123.2.1
@@ -621,6 +621,7 @@ route_output(struct mbuf *m, ...)
 		rn = (struct radix_node *)rt;
 		if (rn == NULL || (rn->rn_flags & RNF_ROOT) != 0) {
 			error = ESRCH;
+			rt = NULL;
 			goto flush;
 		}
 #ifndef SMALL_KERNEL