From 893aa7f3e05790d3efd45b3deaa0b02c014f1224 Mon Sep 17 00:00:00 2001
From: xueyunfei <xueyunfei@espressif.com>
Date: Thu, 13 Feb 2020 17:59:52 +0800
Subject: [PATCH] fix bug for crash when socket lock not initialized

---
 src/api/sockets.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/api/sockets.c b/src/api/sockets.c
index b7ec022f..b0c22283 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -465,6 +465,10 @@ tryget_socket_unconn(int fd)
 {
   struct lwip_sock *ret = tryget_socket_unconn_nouse(fd);
   if (ret != NULL) {
+#if ESP_LWIP_LOCK
+    if (ret->conn == NULL)
+      return NULL;
+#endif /* ESP_LWIP_LOCK */
     if (!sock_inc_used(ret)) {
       return NULL;
     }