From cdd187a7f3f85ef03ad20feef33395a2af24b9a2 Mon Sep 17 00:00:00 2001
From: Andrew Webster <awebster@arcx.com>
Date: Fri, 22 Jan 2016 15:54:45 -0600
Subject: [PATCH] TCP: check for sndcb before using it

---
 net/tcp/tcp_send_buffered.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/net/tcp/tcp_send_buffered.c b/net/tcp/tcp_send_buffered.c
index d25a88567f..8dfa9fae0e 100644
--- a/net/tcp/tcp_send_buffered.c
+++ b/net/tcp/tcp_send_buffered.c
@@ -181,8 +181,11 @@ static inline void psock_lost_connection(FAR struct socket *psock,
 
   /* Do not allow any further callbacks */
 
-  psock->s_sndcb->flags = 0;
-  psock->s_sndcb->event = NULL;
+  if (psock->s_sndcb != NULL)
+    {
+      psock->s_sndcb->flags = 0;
+      psock->s_sndcb->event = NULL;
+    }
 
   /* Free all queued write buffers */