[issue18408] Fixes crashes found by pyfailmalloc

[Roundup Robot]

Roundup Robot added the comment:

New changeset 5a6cdc0d7de1 by Victor Stinner in branch 'default':
Issue #18501, #18408: Fix expat handlers in pyexpat, don't call Python
http://hg.python.org/cpython/rev/5a6cdc0d7de1

----------

_______________________________________
Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18408>
_______________________________________