From a8f0daaf38c5ea18a768a6ee92cd8674f0902ef7 Mon Sep 17 00:00:00 2001
From: dmiller <dmiller@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Sun, 13 Dec 2015 21:39:48 +0000
Subject: [PATCH] Fix a crash in snmp-interfaces:
 http://seclists.org/nmap-dev/2015/q4/218

---
 scripts/snmp-interfaces.nse | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/snmp-interfaces.nse b/scripts/snmp-interfaces.nse
index 054a36476..38e66accb 100644
--- a/scripts/snmp-interfaces.nse
+++ b/scripts/snmp-interfaces.nse
@@ -301,7 +301,12 @@ function process_ips( if_tbl, ip_tbl )
   for _, v in ipairs( ip_tbl ) do
     if ( v.oid:match("^" .. ip_index) ) then
       index = get_value_from_table( ip_tbl, v.oid )
+      if not index then goto NEXT_PROCESS_IPS end
       item = if_tbl[index]
+      if not item then
+        stdnse.debug1("Unknown interface index %s", index)
+        goto NEXT_PROCESS_IPS
+      end
 
       local objid = v.oid:gsub( "^" .. ip_index, ip_addr )
       local value = get_value_from_table( ip_tbl, objid )
@@ -316,6 +321,7 @@ function process_ips( if_tbl, ip_tbl )
       if value then
         item.netmask = value
       end
+      ::NEXT_PROCESS_IPS::
     end
   end