| Description | Apparently libdom is relying on some internal details of libxml2 during parsing (bindings/xml/libxml_xmlparser.c). The first indication of this is that the libdom test suite fails after upgrading to libxml2-2.13.5. Upon closer inspection, libdom is segfaulting because there's a NULL where it isn't expecting one (missing parent).
In short, the problem is with the assumption that this will retrieve the parent element:
xmlNodePtr parent = parser->xml_ctx->node;
In libxml2-2.13.x, XML entities are parsed into a dummy element, and we are retrieving that dummy element with the code above. In earlier versions of libxml2, the same entities were parsed into a temporary context where xml_ctx->node by coincidence still points to the previous node, so it happened to work.
Refs:
* https://bugs.gentoo.org/946980
* https://gitlab.gnome.org/GNOME/libxml2/-/issues/837
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