Nicholas created AXIS2C-1701:
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Summary: Memory leak on duplicate XML namespace declaration
Key: AXIS2C-1701
URL: https://issues.apache.org/jira/browse/AXIS2C-1701
Project: Axis2-C
Issue Type: Bug
Components: xml/om
Affects Versions: Current (Nightly)
Reporter: Nicholas
Attachments: axis.zip
A memory leak exists in the axiom_element_declare_namespace function if the
namespace exists in the parent hierarchy. For example when decoding this
message:
{code:java}
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/";>
<S:Header xmlns="http://www.w3.org/2005/08/addressing";>
<To xmlns="http://www.w3.org/2005/08/addressing";>https://localhost/xxx</To>
<Action xmlns="http://www.w3.org/2005/08/addressing";>ACTION</Action>
<MessageID>XXXX</MessageID>"
</S:Header>
<S:Body />
</S:Envelope>{code}
The duplicate namespace declarations in the "To" and "Action" elements result
in the leak of 2 namespace objects and their strings.
Callers of the function expect that if it returns SUCCESS the namespace
parameter is now owned by the element and then don't free it. But if the
namespace has already been declared in a parent element it returns SUCCESS
without changing the ref count of the parameter.
A real fix would require changing the API so my quick fix is to only search the
current element for a matching namespace and if not found it can be redeclared.
Attached is a reproducer and a patch.
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