gh-124606: Fix reference leak in error path in `datetime_fromisoformat` in `_datetime...

Previously `tzdata` and `dtstr_clean` were not decrefed in the `invalid_iso_midnight` error path of the `datetime_isoformat` function.

diff --git a/Modules/_datetimemodule.c b/Modules/_datetimemodule.c
index 0d91bef2ff9bdac7ac803cc05e3dac938b652903..90527d2a3e0350718673fb5503488dd7bfe15010 100644 (file)
--- a/Modules/_datetimemodule.c
+++ b/Modules/_datetimemodule.c
@@ -5959,6 +5959,8 @@ datetime_fromisoformat(PyObject *cls, PyObject *dtstr)
 
 invalid_iso_midnight:
     PyErr_SetString(PyExc_ValueError, "minute, second, and microsecond must be 0 when hour is 24");
+    Py_DECREF(tzinfo);
+    Py_DECREF(dtstr_clean);
     return NULL;
 
 invalid_string_error: