From 6c0d78caaa8c1b4c23b0444ac5352d63257ff71b Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Tue, 19 Jul 2016 09:05:48 +0200
Subject: [PATCH] Fixed trying to send RST for unconnected (but bound) pcb

---
 src/core/tcp.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/core/tcp.c b/src/core/tcp.c
index 0bc171c5..040d7a0f 100644
--- a/src/core/tcp.c
+++ b/src/core/tcp.c
@@ -464,9 +464,11 @@ tcp_abandon(struct tcp_pcb *pcb, int reset)
     errf = pcb->errf;
 #endif /* LWIP_CALLBACK_API */
     errf_arg = pcb->callback_arg;
-    if ((pcb->state == CLOSED) && (pcb->local_port != 0)) {
-      /* bound, not yet opened */
-      TCP_RMV(&tcp_bound_pcbs, pcb);
+    if (pcb->state == CLOSED) {
+      if (pcb->local_port != 0) {
+        /* bound, not yet opened */
+        TCP_RMV(&tcp_bound_pcbs, pcb);
+      }
     } else {
       send_rst = reset;
       local_port = pcb->local_port;