From b82e26253c9f13c215558f78d8f1eab7cf8f9eb9 Mon Sep 17 00:00:00 2001
From: Anshul Gangwar <anshul.gangwar@citrix.com>
Date: Fri, 9 May 2014 14:49:32 +0530
Subject: [PATCH] CLOUDSTACK-6620: Fixed null pointer exception in hyperv agent
 in getting vmstats, when all vms are deleted from outside

---
 .../hyperv/DotNet/ServerResource/HypervResource/WmiCallsV2.cs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/plugins/hypervisors/hyperv/DotNet/ServerResource/HypervResource/WmiCallsV2.cs b/plugins/hypervisors/hyperv/DotNet/ServerResource/HypervResource/WmiCallsV2.cs
index 7dbb8c14fa1..372f848868c 100644
--- a/plugins/hypervisors/hyperv/DotNet/ServerResource/HypervResource/WmiCallsV2.cs
+++ b/plugins/hypervisors/hyperv/DotNet/ServerResource/HypervResource/WmiCallsV2.cs
@@ -2685,6 +2685,10 @@ namespace HypervResource
 
         public void GetSummaryInfo(Dictionary<string, VmStatsEntry> vmProcessorInfo, List<System.Management.ManagementPath> vmsToInspect)
         {
+            if (vmsToInspect == null || vmsToInspect.Count == 0)
+            {
+                return;
+            }
             // Process info available from WMI, 
             // See http://msdn.microsoft.com/en-us/library/hh850062(v=vs.85).aspx
             uint[] requestedInfo = new uint[] {  // TODO: correct?