Fixed bug #20180 (TCP pcbs listening on IP_ADDR_ANY could get changed in netif_set_ipaddr if previous netif->ip_addr.addr was 0.

CHANGELOG

@@ -204,6 +204,10 @@ HISTORY
 
   ++ Bug fixes:
 
+  2007-06-13 Simon Goldschmidt
+  * netif.c: Fixed bug #20180 (TCP pcbs listening on IP_ADDR_ANY could get
+    changed in netif_set_ipaddr if previous netif->ip_addr.addr was 0.
+
   2007-06-13 Simon Goldschmidt
   * api_msg.c: pcb_new sets conn->err if protocol is not implemented
     -> netconn_new_..() does not allocate a new connection for unsupported

src/core/netif.c

@@ -251,7 +251,8 @@ netif_set_ipaddr(struct netif *netif, struct ip_addr *ipaddr)
     }
     for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = lpcb->next) {
       /* PCB bound to current local interface address? */
-      if (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr))) {
+      if ((!(ip_addr_isany(&(lpcb->local_ip)))) &&
+          (ip_addr_cmp(&(lpcb->local_ip), &(netif->ip_addr)))) {
         /* The PCB is listening to the old ipaddr and
          * is set to listen to the new one instead */
         ip_addr_set(&(lpcb->local_ip), ipaddr);