From f965fb83cfda4e3de3e365f3f94a172730044c22 Mon Sep 17 00:00:00 2001
From: kohsuke <kohsuke@71c3de6d-444a-0410-be80-ed276b4c234a>
Date: Sat, 28 Feb 2009 20:47:11 +0000
Subject: [PATCH] fixed NPEs

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15901 71c3de6d-444a-0410-be80-ed276b4c234a
---
 core/src/main/java/hudson/Functions.java | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/core/src/main/java/hudson/Functions.java b/core/src/main/java/hudson/Functions.java
index 67bedefb83..58fcfeca68 100644
--- a/core/src/main/java/hudson/Functions.java
+++ b/core/src/main/java/hudson/Functions.java
@@ -1062,13 +1062,16 @@ public class Functions {
      */
     public Tag findAncestorTag(Map attributes, String nsUri, String local) {
         Tag tag = (Tag) attributes.get("ownerTag");
-        while(tag!=null) {
+        if(tag==null)   return null;
+
+        while(true) {
             tag = TagSupport.findAncestorWithClass(tag.getParent(), StaplerDynamicTag.class);
+            if(tag==null)
+                return null;
             StaplerDynamicTag stag = (StaplerDynamicTag)tag;
             if(stag.getLocalName().equals(local) && stag.getNsUri().equals(nsUri))
                 return tag;
         }
-        return null;
     }
 
     private static final Pattern SCHEME = Pattern.compile("[a-z]+://.+");
-- 
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