From 1d61ebaa3614504b35ca9881c1f3ffbd87a9efb7 Mon Sep 17 00:00:00 2001
From: jani <jani>
Date: Wed, 5 Nov 2003 08:32:25 +0000
Subject: [PATCH] prevent rcv_wnd wrapping in tcp_recved.patch #2201

---
 src/core/tcp.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/core/tcp.c b/src/core/tcp.c
index 62a4f49a..4ab619da 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -442,9 +442,10 @@ tcp_listen(struct tcp_pcb *pcb)
 void
 tcp_recved(struct tcp_pcb *pcb, u16_t len)
 {
-  pcb->rcv_wnd += len;
-  if (pcb->rcv_wnd > TCP_WND) {
+  if ((u32_t)pcb->rcv_wnd + len > TCP_WND) {
     pcb->rcv_wnd = TCP_WND;
+  } else {
+    pcb->rcv_wnd += len;
   }
   if (!(pcb->flags & TF_ACK_DELAY) &&
      !(pcb->flags & TF_ACK_NOW)) {