From 58761b590ff9b66bf2debc693eb5299c09f668b7 Mon Sep 17 00:00:00 2001
From: kieranm <kieranm>
Date: Tue, 13 Jan 2004 12:10:10 +0000
Subject: [PATCH] Fixed bug in handling of SYN_SENT, where it would move to
 established on an ACK or a SYN, rather than an ACK *and* a SYN.

---
 src/core/tcp_in.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/tcp_in.c b/src/core/tcp_in.c
index ed14340f..aab4bc76 100644
--- a/src/core/tcp_in.c
+++ b/src/core/tcp_in.c
@@ -540,8 +540,8 @@ tcp_process(struct tcp_pcb *pcb)
   case SYN_SENT:
     LWIP_DEBUGF(TCP_INPUT_DEBUG, ("SYN-SENT: ackno %lu pcb->snd_nxt %lu unacked %lu\n", ackno,
      pcb->snd_nxt, ntohl(pcb->unacked->tcphdr->seqno)));
-    if (flags & (TCP_ACK | TCP_SYN) &&
-       ackno == ntohl(pcb->unacked->tcphdr->seqno) + 1) {
+    if ((flags & TCP_ACK) && (flags & TCP_SYN)
+        && ackno == ntohl(pcb->unacked->tcphdr->seqno) + 1) {
       pcb->rcv_nxt = seqno + 1;
       pcb->lastack = ackno;
       pcb->snd_wnd = tcphdr->wnd;