From 65efeec4e9fd9487b9e9c01a69803ea6cd43cbed Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Wed, 7 Oct 2015 14:56:25 +0200
Subject: [PATCH] fixed bug #46145 tcp_send_empty_ack() uses wrong netif with
 LWIP_HOOK_IP4_ROUTE_SRC (patch by Milan  Cermak)

---
 src/core/tcp_out.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/tcp_out.c b/src/core/tcp_out.c
index 1047eb47..a205e8a1 100644
--- a/src/core/tcp_out.c
+++ b/src/core/tcp_out.c
@@ -930,7 +930,7 @@ tcp_send_empty_ack(struct tcp_pcb *pcb)
   }
 #endif
 
-  netif = ip_route(PCB_ISIPV6(pcb), &pcb->remote_ip, &pcb->local_ip);
+  netif = ip_route(PCB_ISIPV6(pcb), &pcb->local_ip, &pcb->remote_ip);
   if (netif == NULL) {
     err = ERR_RTE;
   } else {