From 10afc9e59dd1e1d274062ce8d3923bd3285c006e Mon Sep 17 00:00:00 2001
From: ae <ae@ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f>
Date: Mon, 12 Oct 2015 07:50:27 +0000
Subject: [PATCH] MFC r288528:   Fix possible segmentation fault.

  PR:		203494


git-svn-id: svn://svn.freebsd.org/base/stable/10@289170 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
---
 sbin/ipfw/ipfw2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sbin/ipfw/ipfw2.c b/sbin/ipfw/ipfw2.c
index 587362ae6..ff8395dc7 100644
--- a/sbin/ipfw/ipfw2.c
+++ b/sbin/ipfw/ipfw2.c
@@ -2990,7 +2990,7 @@ ipfw_add(char *av[])
 		action->opcode = O_NAT;
 		action->len = F_INSN_SIZE(ipfw_insn_nat);
 		CHECK_ACTLEN;
-		if (_substrcmp(*av, "global") == 0) {
+		if (*av != NULL && _substrcmp(*av, "global") == 0) {
 			action->arg1 = 0;
 			av++;
 			break;
-- 
2.45.0