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[3.12] gh-108295: Fix crashes with TypeVar weakrefs (GH-108517) (#108527)

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gh-108295: Fix crashes with TypeVar weakrefs (GH-108517)
(cherry picked from commit 482fad7f01)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
This commit is contained in:
Miss Islington (bot) 2023-08-27 07:12:57 -07:00 • committed by GitHub
parent 3e20303717
commit 09877a15d5
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3 changed files with 14 additions and 0 deletions
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10
Lib/test/test_typing.py
View file

@ -544,6 +544,16 @@ class TypeVarTests(BaseTestCase):
with self.assertRaises(TypeError):
list[T][arg]
def test_many_weakrefs(self):
# gh-108295: this used to segfault
for cls in (ParamSpec, TypeVarTuple, TypeVar):
with self.subTest(cls=cls):
vals = weakref.WeakValueDictionary()
for x in range(100000):
vals[x] = cls(str(x))
del vals
def template_replace(templates: list[str], replacements: dict[str, list[str]]) -> list[tuple[str]]:
"""Renders templates with possible combinations of replacements.

1
Misc/NEWS.d/next/Library/2023-08-26-08-38-57.gh-issue-108295.Pn0QRM.rst Normal file
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@ -0,0 +1 @@
Fix crashes related to use of weakrefs on :data:`typing.TypeVar`.

3
Objects/typevarobject.c
View file

@ -201,6 +201,7 @@ typevar_dealloc(PyObject *self)
Py_XDECREF(tv->constraints);
Py_XDECREF(tv->evaluate_constraints);
_PyObject_ClearManagedDict(self);
PyObject_ClearWeakRefs(self);
Py_TYPE(self)->tp_free(self);
Py_DECREF(tp);
@ -743,6 +744,7 @@ paramspec_dealloc(PyObject *self)
Py_DECREF(ps->name);
Py_XDECREF(ps->bound);
_PyObject_ClearManagedDict(self);
PyObject_ClearWeakRefs(self);
Py_TYPE(self)->tp_free(self);
Py_DECREF(tp);
@ -1022,6 +1024,7 @@ typevartuple_dealloc(PyObject *self)
Py_DECREF(tvt->name);
_PyObject_ClearManagedDict(self);
PyObject_ClearWeakRefs(self);
Py_TYPE(self)->tp_free(self);
Py_DECREF(tp);