Avoid touching non-LibXML objects in rxml_node_deregisterNode

sparklemotion/nokogiri#881 (comment)
increments · Sep 10, 2015 · da19c3f · da19c3f
1 parent 37d3ee4
commit da19c3f
Showing 1 changed file with 6 additions and 0 deletions.
diff --git a/ext/libxml/ruby_xml_node.c b/ext/libxml/ruby_xml_node.c
@@ -3,6 +3,7 @@
 #include <assert.h>
 
 VALUE cXMLNode;
+const char* kLibXMLNamespace = "LibXML::";
 
 /* Document-class: LibXML::XML::Node
  *
@@ -54,6 +55,11 @@ static void rxml_node_deregisterNode(xmlNodePtr xnode)
         return;
     }
 
+    const char* className = rb_obj_classname(node);
+    if (strncmp(className, kLibXMLNamespace, strlen(kLibXMLNamespace)) != 0) {
+        return;
+    }
+
     RDATA(node)->data = NULL;
     RDATA(node)->dfree = NULL;
     RDATA(node)->dmark = NULL;