From 0d5c1df11b85299573a7b90afc4f687ceff73e38 Mon Sep 17 00:00:00 2001
From: krw <krw@openbsd.org>
Date: Sun, 11 Feb 2018 22:00:19 +0000
Subject: [PATCH] Ooops. After getting a NAK in response to a renewal REQUEST,
 we delete the interface's address and thus the cached configuration data
 becomes invalid and must be discarded.

Issue found & fix tested by Christer Solskogen. Thanks!
---
 sbin/dhclient/dhclient.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sbin/dhclient/dhclient.c b/sbin/dhclient/dhclient.c
index 608b4176763..df3118a6765 100644
--- a/sbin/dhclient/dhclient.c
+++ b/sbin/dhclient/dhclient.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: dhclient.c,v 1.563 2018/02/11 04:16:58 krw Exp $	*/
+/*	$OpenBSD: dhclient.c,v 1.564 2018/02/11 22:00:19 krw Exp $	*/
 
 /*
  * Copyright 2004 Henning Brauer <henning@openbsd.org>
@@ -932,6 +932,8 @@ dhcpnak(struct interface_info *ifi, const char *src)
 	free_client_lease(ifi->active);
 
 	ifi->active = NULL;
+	free(ifi->configured);
+	ifi->configured = NULL;
 
 	/* Stop sending DHCPREQUEST packets. */
 	cancel_timeout(ifi);
-- 
2.20.1