From 3b715f4602d1a0249fb9e710a4a35579b838fea3 Mon Sep 17 00:00:00 2001
From: likewise <likewise>
Date: Mon, 3 Jan 2005 17:54:21 +0000
Subject: [PATCH] 3 January 2004,  Leon Woestenberg <leon.woestenberg@gmx>
 udp.c: pcb->recv() callback was called even when it was NULL.

---
 src/core/udp.c | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/core/udp.c b/src/core/udp.c
index 8343d34d..948848a3 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -280,14 +280,18 @@ udp_input(struct pbuf *p, struct netif *inp)
     pbuf_header(p, -UDP_HLEN);
     if (pcb != NULL) {
       snmp_inc_udpindatagrams();
-      pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src);
+      /* callback */
+      if (pcb->recv != NULL)
+      {
+        pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src);
+      }
 #if SO_REUSE
       /* First socket should receive now */
-      if(reuse_port_1 || reuse_port_2) {
+      if (reuse_port_1 || reuse_port_2) {
         /* We want to search on next socket after receiving */
         pcb_temp = pcb->next;
         
-        if(reuse_port_1) {
+        if (reuse_port_1) {
           /* We are searching connected sockets */
           reuse_port_1 = 0;
           reuse_port_2 = 0;