From 3c0a25e9f58877ab3a8bafbb4bd2697479689291 Mon Sep 17 00:00:00 2001
From: mpi <mpi@openbsd.org>
Date: Fri, 22 Jul 2016 07:39:06 +0000
Subject: [PATCH] Fix a double rtfree(9) triggered when IPSEC inserts a more
 specific route because of PMTU.

otto@ reported the issue and helped me tracking it down during more
than one month, he is the man!

mikeb@ figured out the bug was in the forwarding path.

ok mikeb@, deraadt@, claudio@
---
 sys/netinet/ip_input.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sys/netinet/ip_input.c b/sys/netinet/ip_input.c
index 51f9986e9f6..a1b33c6667b 100644
--- a/sys/netinet/ip_input.c
+++ b/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: ip_input.c,v 1.278 2016/07/18 13:17:44 bluhm Exp $	*/
+/*	$OpenBSD: ip_input.c,v 1.279 2016/07/22 07:39:06 mpi Exp $	*/
 /*	$NetBSD: ip_input.c,v 1.30 1996/03/16 23:53:58 christos Exp $	*/
 
 /*
@@ -1488,6 +1488,7 @@ ip_forward(struct mbuf *m, struct ifnet *ifp, struct rtentry *rt, int srcrt)
 	error = ip_output(m, NULL, &ro,
 	    (IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
 	    NULL, NULL, 0);
+	rt = ro.ro_rt;
 	if (error)
 		ipstat.ips_cantforward++;
 	else {
-- 
2.20.1