From 2919001e3ee681dfd906d432f7f6823458db11b1 Mon Sep 17 00:00:00 2001
From: "chao.an" <anchao@xiaomi.com>
Date: Thu, 18 Mar 2021 23:30:40 +0800
Subject: [PATCH] net/tcp: do not start the tcp monitor if unestablished

Change-Id: Iace9ccfc73086db442db04b95bc508dd48827b82
Signed-off-by: chao.an <anchao@xiaomi.com>
---
 net/socket/net_dup2.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/net/socket/net_dup2.c b/net/socket/net_dup2.c
index 4ff03637e5d..140da6d120f 100644
--- a/net/socket/net_dup2.c
+++ b/net/socket/net_dup2.c
@@ -46,6 +46,7 @@
 #include <debug.h>
 
 #include <nuttx/net/net.h>
+#include <nuttx/net/tcp.h>
 
 #include "inet/inet.h"
 #include "tcp/tcp.h"
@@ -74,6 +75,7 @@
 
 int psock_dup2(FAR struct socket *psock1, FAR struct socket *psock2)
 {
+  FAR struct tcp_conn_s *conn;
   int ret = OK;
 
   /* Parts of this operation need to be atomic */
@@ -112,7 +114,11 @@ int psock_dup2(FAR struct socket *psock1, FAR struct socket *psock2)
    * the network connection is lost.
    */
 
-  if (psock2->s_type == SOCK_STREAM)
+  conn = (FAR struct tcp_conn_s *)psock2->s_conn;
+
+  if (psock2->s_type == SOCK_STREAM && conn &&
+      (conn->tcpstateflags == TCP_ESTABLISHED ||
+       conn->tcpstateflags == TCP_SYN_RCVD))
     {
       ret = tcp_start_monitor(psock2);