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gh-140474: Fix memory leak in array.array (GH-140478)

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Stan Ulbrych 2025-10-23 10:49:27 +01:00 • committed by GitHub
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8
Lib/test/test_array.py
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@ -1255,6 +1255,14 @@ def test_typecode_u_deprecation(self):
with self.assertWarns(DeprecationWarning):
array.array("u")
def test_empty_string_mem_leak_gh140474(self):
with warnings.catch_warnings():
warnings.simplefilter('ignore', DeprecationWarning)
for _ in range(1000):
a = array.array('u', '')
self.assertEqual(len(a), 0)
self.assertEqual(a.typecode, 'u')
class UCS4Test(UnicodeTest):
typecode = 'w'

2
Misc/NEWS.d/next/Library/2025-10-22-20-52-13.gh-issue-140474.xIWlip.rst Normal file
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@ -0,0 +1,2 @@
Fix memory leak in :class:`array.array` when creating arrays from an empty
:class:`str` and the ``u`` type code.

3
Modules/arraymodule.c
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@ -2833,6 +2833,9 @@ array_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
Py_SET_SIZE(self, n);
self->allocated = n;
}
else {
PyMem_Free(ustr);
}
}
else { // c == 'w'
Py_ssize_t n = PyUnicode_GET_LENGTH(initial);