Author: tilman
Date: Thu Jul 30 09:03:19 2026
New Revision: 1936723
Log:
PDFBOX-6228: catch cycle
Modified:
pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/documentinterchange/logicalstructure/PDStructureElement.java
Modified:
pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/documentinterchange/logicalstructure/PDStructureElement.java
==============================================================================
---
pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/documentinterchange/logicalstructure/PDStructureElement.java
Thu Jul 30 08:49:31 2026 (r1936722)
+++
pdfbox/trunk/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/documentinterchange/logicalstructure/PDStructureElement.java
Thu Jul 30 09:03:19 2026 (r1936723)
@@ -18,7 +18,12 @@ package org.apache.pdfbox.pdmodel.docume
import java.util.Arrays;
import java.util.Collections;
+import java.util.HashSet;
import java.util.Map;
+import java.util.Set;
+
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
import org.apache.pdfbox.cos.COSArray;
import org.apache.pdfbox.cos.COSBase;
@@ -42,6 +47,8 @@ public class PDStructureElement extends
public static final String TYPE = "StructElem";
+ private static final Logger LOG =
LogManager.getLogger(PDStructureElement.class);
+
/**
* Constructor with required values.
*
@@ -731,9 +738,15 @@ public class PDStructureElement extends
*/
private PDStructureTreeRoot getStructureTreeRoot()
{
+ Set<COSDictionary> visited = new HashSet<>();
PDStructureNode parent = this.getParent();
while (parent instanceof PDStructureElement)
{
+ if (!visited.add(parent.getCOSObject()))
+ {
+ LOG.warn("Element ignored: {}", parent.getCOSObject());
+ return null; // Cycle detected
+ }
parent = ((PDStructureElement) parent).getParent();
}
if (parent instanceof PDStructureTreeRoot)
