New submission from Oren Milman <[email protected]>:
The following code results in refleaks:
import sys
import _elementtree
builder = _elementtree.TreeBuilder()
parser = _elementtree.XMLParser(target=builder)
refcount_before = sys.gettotalrefcount()
parser.__init__(target=builder)
print(sys.gettotalrefcount() - refcount_before) # should be close to 0
This is because _elementtree_XMLParser___init___impl()
(in Modules/_elementtree.c) doesn't decref before assigning to fields of
`self`.
The following code also results in refleaks:
import sys
import _elementtree
elem = _elementtree.Element(42)
elem.__setstate__({'tag': 42, '_children': list(range(1000))})
refcount_before = sys.gettotalrefcount()
elem.__setstate__({'tag': 42, '_children': []})
print(sys.gettotalrefcount() - refcount_before) # should be close to -1000
This is because element_setstate_from_attributes() doesn't decref the old
children before storing the new children.
I would open a PR to fix this soon.
----------
components: XML
messages: 304145
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: various refleaks in _elementtree
type: resource usage
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue31758>
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