From 93f9c56c325b0172fdd1781ff48e445ae438e052 Mon Sep 17 00:00:00 2001
From: goldsimon <goldsimon@gmx.de>
Date: Sat, 27 Jan 2018 14:45:17 +0100
Subject: [PATCH] fix bug #52976: lwip_ioctl() FIONREAD crash

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

diff --git a/src/api/sockets.c b/src/api/sockets.c
index 11c94f39..da0d6c23 100644
--- a/src/api/sockets.c
+++ b/src/api/sockets.c
@@ -3726,7 +3726,7 @@ lwip_ioctl(int s, long cmd, void *argp)
 
       /* Check if there is data left from the last recv operation. /maq 041215 */
       if (sock->lastdata.netbuf) {
-        if (NETCONNTYPE_GROUP(netconn_type(sock->conn)) != NETCONN_TCP) {
+        if (NETCONNTYPE_GROUP(netconn_type(sock->conn)) == NETCONN_TCP) {
           recv_avail += sock->lastdata.pbuf->tot_len;
         } else {
           recv_avail += sock->lastdata.netbuf->p->tot_len;