Author: markt
Date: Mon Jul 27 09:48:53 2015
New Revision: 1692850
URL: http://svn.apache.org/r1692850
Log:
Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=58179
Fix atomicity violation (concurrent requests could both see null as the old
value)
Modified:
tomcat/tc8.0.x/trunk/ (props changed)
tomcat/tc8.0.x/trunk/java/org/apache/catalina/core/ApplicationContext.java
tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
Propchange: tomcat/tc8.0.x/trunk/
------------------------------------------------------------------------------
--- svn:mergeinfo (original)
+++ svn:mergeinfo Mon Jul 27 09:48:53 2015
@@ -1 +1 @@
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Modified:
tomcat/tc8.0.x/trunk/java/org/apache/catalina/core/ApplicationContext.java
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/java/org/apache/catalina/core/ApplicationContext.java?rev=1692850&r1=1692849&r2=1692850&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/java/org/apache/catalina/core/ApplicationContext.java
(original)
+++ tomcat/tc8.0.x/trunk/java/org/apache/catalina/core/ApplicationContext.java
Mon Jul 27 09:48:53 2015
@@ -782,17 +782,13 @@ public class ApplicationContext
return;
}
- Object oldValue = null;
- boolean replaced = false;
-
// Add or replace the specified attribute
// Check for read only attribute
if (readOnlyAttributes.containsKey(name))
return;
- oldValue = attributes.get(name);
- if (oldValue != null)
- replaced = true;
- attributes.put(name, value);
+
+ Object oldValue = attributes.put(name, value);
+ boolean replaced = oldValue != null;
// Notify interested application event listeners
Object listeners[] = context.getApplicationEventListeners();
Modified: tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml
URL:
http://svn.apache.org/viewvc/tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml?rev=1692850&r1=1692849&r2=1692850&view=diff
==============================================================================
--- tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml (original)
+++ tomcat/tc8.0.x/trunk/webapps/docs/changelog.xml Mon Jul 27 09:48:53 2015
@@ -77,6 +77,11 @@
Fix possible resource leaks by closing streams properly.
Issues reported by Coverity Scan. (violetagg)
</fix>
+ <fix>
+ <bug>58179</bug>: Fix a thread safety issues that could mean concurrent
+ threads setting the same attribute on a <code>ServletContext</code>
+ could both see <code>null</code> as the old value. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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