diff --git a/CHANGELOG b/CHANGELOG
index 53a852c4..5cb5bde3 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -25,6 +25,10 @@ HISTORY
 
   ++ Bugfixes:
 
+  2009-08-23 Simon Goldschmidt
+  * udp.c: bug #27252: Address pointer invalid after freeing pbuf in UDP
+    receive callback
+
   2009-08-23 Simon Goldschmidt
   * many ppp files: bug #27267: Added include to string.h where needed
 
diff --git a/src/core/udp.c b/src/core/udp.c
index d8d644d4..b884d755 100644
--- a/src/core/udp.c
+++ b/src/core/udp.c
@@ -281,8 +281,10 @@ udp_input(struct pbuf *p, struct netif *inp)
       snmp_inc_udpindatagrams();
       /* callback */
       if (pcb->recv != NULL) {
+        /* copy the source address to make it independent of the pbuf */
+        struct ip_addr src_addr = iphdr->src;
         /* now the recv function is responsible for freeing p */
-        pcb->recv(pcb->recv_arg, pcb, p, &(iphdr->src), src);
+        pcb->recv(pcb->recv_arg, pcb, p, &src_addr, src);
       } else {
         /* no recv function registered? then we have to free the pbuf! */
         pbuf_free(p);