From 8ae3ee2c7c5588504e02a35aab007e370b497df4 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Mon, 6 Aug 2018 21:23:07 +0000
Subject: [PATCH] Avoid crash if only testing port for likely SSL, not host.
 Fixes #1286

---
 nselib/shortport.lua | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/nselib/shortport.lua b/nselib/shortport.lua
index df2583889..79f439857 100644
--- a/nselib/shortport.lua
+++ b/nselib/shortport.lua
@@ -234,6 +234,8 @@ function ssl(host, port)
     port_or_service(LIKELY_SSL_PORTS, LIKELY_SSL_SERVICES, {"tcp", "sctp"})(host, port) then
     return true
   end
+  -- If we're just looking up port info, stop here.
+  if not host then return false end
   -- if we didn't detect something *not* SSL, check it ourselves
   if port.version and port.version.name_confidence <= 3 and host.registry then
     comm = comm or require "comm"