From bfff02c00385feba46a425a25ade7200649736e0 Mon Sep 17 00:00:00 2001
From: Christopher Schramm <git@cschramm.eu>
Date: Fri, 10 Feb 2023 18:15:50 +0400
Subject: [PATCH 1/2] gh-71587: Clear cached strptime module

---
 Modules/_datetimemodule.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index eda8c5610ba659..27b8d1897538dc 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -5189,22 +5189,23 @@ datetime_utcfromtimestamp(PyObject *cls, PyObject *args)
     return result;
 }
 
+static PyObject *strptime_module = NULL;
+
 /* Return new datetime from _strptime.strptime_datetime(). */
 static PyObject *
 datetime_strptime(PyObject *cls, PyObject *args)
 {
-    static PyObject *module = NULL;
     PyObject *string, *format;
 
     if (!PyArg_ParseTuple(args, "UU:strptime", &string, &format))
         return NULL;
 
-    if (module == NULL) {
-        module = PyImport_ImportModule("_strptime");
-        if (module == NULL)
+    if (strptime_module == NULL) {
+        strptime_module = PyImport_ImportModule("_strptime");
+        if (strptime_module == NULL)
             return NULL;
     }
-    return PyObject_CallMethodObjArgs(module, &_Py_ID(_strptime_datetime),
+    return PyObject_CallMethodObjArgs(strptime_module, &_Py_ID(_strptime_datetime),
                                          cls, string, format, NULL);
 }
 
@@ -6863,12 +6864,17 @@ _datetime_exec(PyObject *module)
     return 0;
 }
 
+static void module_free(void*) {
+    strptime_module = NULL;
+}
+ 
 static struct PyModuleDef datetimemodule = {
     PyModuleDef_HEAD_INIT,
     .m_name = "_datetime",
     .m_doc = "Fast implementation of the datetime type.",
     .m_size = -1,
     .m_methods = module_methods,
+    .m_free = module_free,
 };
 
 PyMODINIT_FUNC

From fe1c392b14b1ce3cc5af95f3f92c5b7515e5f2af Mon Sep 17 00:00:00 2001
From: Alexander Belopolsky <alexander.belopolsky@gmail.com>
Date: Sat, 11 Feb 2023 07:53:15 +0400
Subject: [PATCH 2/2] gh-71587: Don't leak a reference

---
 Modules/_datetimemodule.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index 27b8d1897538dc..2d96b7acce54c0 100644
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -6864,8 +6864,8 @@ _datetime_exec(PyObject *module)
     return 0;
 }
 
-static void module_free(void*) {
-    strptime_module = NULL;
+static void module_free(void *_) {
+    Py_CLEAR(strptime_module);
 }
  
 static struct PyModuleDef datetimemodule = {