From 55831567255f447cf0babfa65f4c9cf556c553b8 Mon Sep 17 00:00:00 2001
From: david <david@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Fri, 1 Mar 2013 02:10:53 +0000
Subject: [PATCH] Check for an empty host batch before ping scanning.

This was a regression related to target deferral. It caused a null
pointer dereference if all your targets failed to resolve or were
excluded.
---
 targets.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/targets.cc b/targets.cc
index b0fdacaf2..513adf9b5 100644
--- a/targets.cc
+++ b/targets.cc
@@ -598,6 +598,9 @@ static void refresh_hostbatch(HostGroupState *hs, const addrset *exclude_group,
     hs->hostbatch[hs->current_batch_sz++] = t;
   }
 
+  if (hs->current_batch_sz == 0)
+    return;
+
   /* OK, now we have our complete batch of entries.  The next step is to
      randomize them (if requested) */
   if (hs->randomize) {