dhcpserver: Fix crash when switching wifi mode

See Teamwork 7058.

diff --git a/components/lwip/apps/dhcpserver.c b/components/lwip/apps/dhcpserver.c
index ca0592c917742df5f5b9ada0daa94ef9ecb03dd2..4cdef4123df788f0e9ae9acbc445e4d70ef0b0df 100644 (file)
--- 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;
     }