[3.12] gh-86493: Fix possible leaks in some modules initialization (GH-106768) (GH-106855)

Fix _ssl, _stat, _testinternalcapi, _threadmodule, cmath, math, posix, time.
(cherry picked from commit 3e65baee72131b49f4ce8ca2da568a6f2001ce93)

1 files changed, 10 insertions, 19 deletions

diff --git a/Python/modsupport.c b/Python/modsupport.c
index be229c9..df4ae35 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -649,13 +649,16 @@ PyModule_AddObjectRef(PyObject *mod, const char *name, PyObject *value)
                      PyModule_GetName(mod));
         return -1;
     }
-
-    if (PyDict_SetItemString(dict, name, value)) {
-        return -1;
-    }
-    return 0;
+    return PyDict_SetItemString(dict, name, value);
 }
 
+int
+_PyModule_Add(PyObject *mod, const char *name, PyObject *value)
+{
+    int res = PyModule_AddObjectRef(mod, name, value);
+    Py_XDECREF(value);
+    return res;
+}
 
 int
 PyModule_AddObject(PyObject *mod, const char *name, PyObject *value)
@@ -670,25 +673,13 @@ PyModule_AddObject(PyObject *mod, const char *name, PyObject *value)
 int
 PyModule_AddIntConstant(PyObject *m, const char *name, long value)
 {
-    PyObject *obj = PyLong_FromLong(value);
-    if (!obj) {
-        return -1;
-    }
-    int res = PyModule_AddObjectRef(m, name, obj);
-    Py_DECREF(obj);
-    return res;
+    return _PyModule_Add(m, name, PyLong_FromLong(value));
 }
 
 int
 PyModule_AddStringConstant(PyObject *m, const char *name, const char *value)
 {
-    PyObject *obj = PyUnicode_FromString(value);
-    if (!obj) {
-        return -1;
-    }
-    int res = PyModule_AddObjectRef(m, name, obj);
-    Py_DECREF(obj);
-    return res;
+    return _PyModule_Add(m, name, PyUnicode_FromString(value));
 }
 
 int