From 89abd1f58e0c793fac4d191e1b77f1d71244fe4d Mon Sep 17 00:00:00 2001
From: likewise <likewise>
Date: Wed, 8 Sep 2004 22:33:46 +0000
Subject: [PATCH] Do no longer try to free pbuf when TCP_EVENT_RECV() is called
 without a callback handler, and without packet. The standard HTTP server
 failed on this (as reported by three users).

---
 src/include/lwip/tcp.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/include/lwip/tcp.h b/src/include/lwip/tcp.h
index d200e7c3..23fbbbba 100644
--- a/src/include/lwip/tcp.h
+++ b/src/include/lwip/tcp.h
@@ -375,7 +375,7 @@ err_t lwip_tcp_event(void *arg, struct tcp_pcb *pcb,
 #define TCP_EVENT_RECV(pcb,p,err,ret) \
                         if((pcb)->recv != NULL) \
                         { ret = (pcb)->recv((pcb)->callback_arg,(pcb),(p),(err)); } else { \
-            pbuf_free(p); }
+                          if (p) pbuf_free(p); }
 #define TCP_EVENT_CONNECTED(pcb,err,ret) \
                         if((pcb)->connected != NULL) \
                         (ret = (pcb)->connected((pcb)->callback_arg,(pcb),(err)))