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[3.13] gh-121652: Handle `allocate_weakref` returning NULL (GH-121653) (#121721) 

The `allocate_weakref` may return NULL when out of memory. We need to
handle that case and propagate the error.
(cherry picked from commit a640a605a8)

Co-authored-by: Sam Gross <colesbury@gmail.com>
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Miss Islington (bot) 2024-07-13 18:31:50 +02:00 committed by GitHub
parent f0c29a2d9f
commit f78e1aa1f0
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Objects/weakrefobject.c
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@ -426,6 +426,10 @@ get_or_create_weakref(PyTypeObject *type, PyObject *obj, PyObject *callback)
return basic_ref;
}
PyWeakReference *newref = allocate_weakref(type, obj, callback);
if (newref == NULL) {
UNLOCK_WEAKREFS(obj);
return NULL;
}
insert_weakref(newref, list);
UNLOCK_WEAKREFS(obj);
return newref;
@ -433,6 +437,9 @@ get_or_create_weakref(PyTypeObject *type, PyObject *obj, PyObject *callback)
else {
// We may not be able to safely allocate inside the lock
PyWeakReference *newref = allocate_weakref(type, obj, callback);
if (newref == NULL) {
return NULL;
}
LOCK_WEAKREFS(obj);
insert_weakref(newref, list);
UNLOCK_WEAKREFS(obj);