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[3.14] gh-143145: Fix possible reference leak in ctypes _build_result() (GH-143131) (GH-143169)

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The result tuple was leaked if __ctypes_from_outparam__() failed for any item.
(cherry picked from commit 579c5b496b)

Signed-off-by: Yongtao Huang <yongtaoh2022@gmail.com>
Co-authored-by: Yongtao Huang <yongtaoh2022@gmail.com>
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Miss Islington (bot) 2025-12-25 18:09:53 +01:00 • committed by GitHub
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commit 88a4d0d34b
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Misc/NEWS.d/next/Library/2025-12-24-14-18-52.gh-issue-143145.eXLw8D.rst Normal file
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@ -0,0 +1 @@
Fixed a possible reference leak in ctypes when constructing results with multiple output parameters on error.

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Modules/_ctypes/_ctypes.c
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@ -4551,6 +4551,7 @@ _build_result(PyObject *result, PyObject *callargs,
v = PyTuple_GET_ITEM(callargs, i);
v = PyObject_CallMethodNoArgs(v, &_Py_ID(__ctypes_from_outparam__));
if (v == NULL || numretvals == 1) {
Py_XDECREF(tup);
Py_DECREF(callargs);
return v;
}