From f66e0fcfb93fa68e735882ed261eeed98ef30be1 Mon Sep 17 00:00:00 2001
From: henri <henri@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Thu, 12 Jul 2012 17:17:46 +0000
Subject: [PATCH] Ensure that inheritable_socket() returned a valid FD before
 passing it to Setsockopt().

---
 ncat/util.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/ncat/util.c b/ncat/util.c
index 2aaaf847c..0e0f64637 100644
--- a/ncat/util.c
+++ b/ncat/util.c
@@ -382,6 +382,8 @@ int do_listen(int type, int proto, const union sockaddr_u *srcaddr_u)
        ncat_exec_win.c, for --exec and --sh-exec. inheritable_socket is from
        nbase. */
     sock = inheritable_socket(srcaddr_u->storage.ss_family, type, proto);
+    if (sock < 0)
+      bye("socket: %s", socket_strerror(socket_errno()));
 
     Setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &option_on, sizeof(int));