From 091d848838a29924501322e44e71e7e6db850f00 Mon Sep 17 00:00:00 2001
From: david <david@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Mon, 28 May 2012 17:44:10 +0000
Subject: [PATCH] Prevent a null pointer dereference in nse_nsock_get_ssl.

This could be provoked by a script calling nmap.get_ssl_certificate on
an unconnected socket.
---
 nse_nsock.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nse_nsock.cc b/nse_nsock.cc
index 1ff0a0308..415be50bc 100644
--- a/nse_nsock.cc
+++ b/nse_nsock.cc
@@ -709,7 +709,7 @@ SSL *nse_nsock_get_ssl (lua_State *L)
 {
   nse_nsock_udata *nu = check_nsock_udata(L, 1, 0);
 
-  if (!nsi_checkssl(nu->nsiod))
+  if (nu->nsiod == NULL || !nsi_checkssl(nu->nsiod))
     luaL_argerror(L, 1, "not a SSL socket");
 
   return (SSL *) nsi_getssl(nu->nsiod);