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[3.13] gh-142595: add type check for namedtuple call during decimal initialization (GH-142608) #142622

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[3.13] gh-142595: add type check for namedtuple call during decimal initialization (GH-142608) #142622

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-12-02-56-26.gh-issue-142595.wHvTqq.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Added type check during initialization of the :mod:`decimal` module to
prevent a crash in case of broken stdlib. Patch by Sergey B Kirpichev.
12 changes: 8 additions & 4 deletions Modules/_decimal/_decimal.c
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Original file line number Diff line number Diff line change
Expand Up @@ -5922,10 +5922,14 @@ _decimal_exec(PyObject *m)

/* DecimalTuple */
ASSIGN_PTR(collections, PyImport_ImportModule("collections"));
ASSIGN_PTR(state->DecimalTuple, (PyTypeObject *)PyObject_CallMethod(collections,
"namedtuple", "(ss)", "DecimalTuple",
"sign digits exponent"));

obj = PyObject_CallMethod(collections, "namedtuple", "(ss)", "DecimalTuple",
"sign digits exponent");
if (!PyType_Check(obj)) {
PyErr_SetString(PyExc_TypeError,
"type is expected from namedtuple call");
goto error;
}
ASSIGN_PTR(state->DecimalTuple, (PyTypeObject *)obj);
ASSIGN_PTR(obj, PyUnicode_FromString("decimal"));
CHECK_INT(PyDict_SetItemString(state->DecimalTuple->tp_dict, "__module__", obj));
Py_CLEAR(obj);
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