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markt-asf pushed a commit to branch 9.0.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git
The following commit(s) were added to refs/heads/9.0.x by this push:
new f866633d21 Fix potential deadlock on copy
f866633d21 is described below
commit f866633d21f32995e2dbd2a09f243f100e7f1645
Author: Mark Thomas <[email protected]>
AuthorDate: Wed Jun 10 11:29:02 2026 +0100
Fix potential deadlock on copy
---
java/org/apache/catalina/servlets/WebdavServlet.java | 18 ++++++++++++++++--
webapps/docs/changelog.xml | 3 +++
2 files changed, 19 insertions(+), 2 deletions(-)
diff --git a/java/org/apache/catalina/servlets/WebdavServlet.java
b/java/org/apache/catalina/servlets/WebdavServlet.java
index 2de1fa80f7..d3c0245c9f 100644
--- a/java/org/apache/catalina/servlets/WebdavServlet.java
+++ b/java/org/apache/catalina/servlets/WebdavServlet.java
@@ -2987,8 +2987,22 @@ public class WebdavServlet extends DefaultServlet
implements PeriodicEventListen
propertiesDest = new ArrayList<>();
deadProperties.put(destination, propertiesDest);
}
- synchronized (properties) {
- synchronized (propertiesDest) {
+ /*
+ * The following ensures that locks for any two paths are
always obtained in the same other order
+ * regardless of which is the source and which is the
destination. This is to avoid deadlocks for
+ * concurrent calls where source and destination are reversed.
+ */
+ Object lockFirst;
+ Object lockSecond;
+ if (source.compareTo(destination) > 0) {
+ lockFirst = properties;
+ lockSecond = propertiesDest;
+ } else {
+ lockFirst = propertiesDest;
+ lockSecond = properties;
+ }
+ synchronized (lockFirst) {
+ synchronized (lockSecond) {
for (Node node : properties) {
node = node.cloneNode(true);
boolean found = false;
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index 44168590bb..42d8bdaa5d 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -264,6 +264,9 @@
<code>server.xml</code>. Cluster digester rules are now fully
conditional on both JARs being available. (dsoumis)
</fix>
+ <fix>
+ Fix a potential deadlock when copying resources using WebDAV. (markt)
+ </fix>
</changelog>
</subsection>
<subsection name="Coyote">
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