From 064d2b4ecbc6a3fbdb1c76049dd159e6673243af Mon Sep 17 00:00:00 2001
From: Xu Chun Guang <xuchunguang@espressif.com>
Date: Wed, 14 Sep 2016 16:14:50 +0800
Subject: [PATCH] dhcpserver: Fix crash when switching wifi mode

See Teamwork 7058.
---
 components/lwip/apps/dhcpserver.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/components/lwip/apps/dhcpserver.c b/components/lwip/apps/dhcpserver.c
index ca0592c91..4cdef4123 100644
--- a/components/lwip/apps/dhcpserver.c
+++ b/components/lwip/apps/dhcpserver.c
@@ -1070,9 +1070,8 @@ void dhcps_stop(struct netif *netif)
         return;
     }
 
-    udp_disconnect(pcb_dhcps);
-
     if (apnetif->dhcps_pcb != NULL) {
+        udp_disconnect(apnetif->dhcps_pcb);
         udp_remove(apnetif->dhcps_pcb);
         apnetif->dhcps_pcb = NULL;
     }