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

The result tuple was leaked if __ctypes_from_outparam__() failed for any item.
(cherry picked from commit 579c5b496b467a2b175cb30caa4f6873cb13c9a1)

Signed-off-by: Yongtao Huang <yongtaoh2022@gmail.com>
Co-authored-by: Yongtao Huang <yongtaoh2022@gmail.com>

diff --git a/Misc/NEWS.d/next/Library/2025-12-24-14-18-52.gh-issue-143145.eXLw8D.rst b/Misc/NEWS.d/next/Library/2025-12-24-14-18-52.gh-issue-143145.eXLw8D.rst
new file mode 100644 (file)
index 0000000..2aff109
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-12-24-14-18-52.gh-issue-143145.eXLw8D.rst
@@ -0,0 +1 @@
+Fixed a possible reference leak in ctypes when constructing results with multiple output parameters on error.

diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index ad088b0ce8e2e7c7125e907b923f0600a175f695..7419d629399e2c9d556856cb4560eee41562ae95 100644 (file)
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -4273,6 +4273,7 @@ _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;
             }