From 553c4203abf911cb72a40e72d88e31419c051cba Mon Sep 17 00:00:00 2001
From: sg <goldsimon@gmx.de>
Date: Fri, 6 Mar 2015 20:25:51 +0100
Subject: [PATCH] tcp/udp_netif_ipv4_addr_changed(): don't change
 specific-address of local tcp_listen/udp_pcb to ANY on address change

---
 src/core/tcp.c | 14 +++++++-------
 src/core/udp.c | 16 +++++++++-------
 2 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/src/core/tcp.c b/src/core/tcp.c
index a323a270..36afd457 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -1843,15 +1843,15 @@ void tcp_netif_ipv4_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new
   tcp_netif_ipv4_addr_changed_pcblist(old_addr, tcp_active_pcbs);
   tcp_netif_ipv4_addr_changed_pcblist(old_addr, tcp_bound_pcbs);
 
-  /* PCB bound to current local interface address? */
-  for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = next) {
-    next = lpcb->next;
+  if (!ip_addr_isany(new_addr)) {
     /* PCB bound to current local interface address? */
-    if ((!(ip_addr_isany(ipX_2_ip(&lpcb->local_ip)))) &&
-        (ip_addr_cmp(ipX_2_ip(&lpcb->local_ip), old_addr))) {
-      if (new_addr != NULL) {
+    for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = next) {
+      next = lpcb->next;
+      /* PCB bound to current local interface address? */
+      if ((!(ip_addr_isany(ipX_2_ip(&lpcb->local_ip)))) &&
+          (ip_addr_cmp(ipX_2_ip(&lpcb->local_ip), old_addr))) {
         /* The PCB is listening to the old ipaddr and
-          * is set to listen to the new one instead */
+         * is set to listen to the new one instead */
         ip_addr_set(ipX_2_ip(&lpcb->local_ip), new_addr);
       }
     }
diff --git a/src/core/udp.c b/src/core/udp.c
index 01ff470d..e0ffd619 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -1160,13 +1160,15 @@ void udp_netif_ipv4_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new
 {
   struct udp_pcb* upcb;
 
-  for (upcb = udp_pcbs; upcb != NULL; upcb = upcb->next) {
-    /* PCB bound to current local interface address? */
-    if ((!(ip_addr_isany(ipX_2_ip(&upcb->local_ip)))) &&
-        (ip_addr_cmp(ipX_2_ip(&upcb->local_ip), old_addr))) {
-      /* The PCB is bound to the old ipaddr and
-        * is set to bound to the new one instead */
-      ip_addr_set(ipX_2_ip(&upcb->local_ip), new_addr);
+  if (!ip_addr_isany(new_addr)) {
+    for (upcb = udp_pcbs; upcb != NULL; upcb = upcb->next) {
+      /* PCB bound to current local interface address? */
+      if ((!(ip_addr_isany(ipX_2_ip(&upcb->local_ip)))) &&
+          (ip_addr_cmp(ipX_2_ip(&upcb->local_ip), old_addr))) {
+        /* The PCB is bound to the old ipaddr and
+          * is set to bound to the new one instead */
+        ip_addr_set(ipX_2_ip(&upcb->local_ip), new_addr);
+      }
     }
   }
 }