`pythonrun.c`: main_module ref leak in `_PyRun_SimpleStringFlagsWithName`

[A0su]

Bug report

Bug description:

Bug report

Bug description:

This is a sub-issue for #146102 and original gist details can be found here

Existing code:

int
_PyRun_SimpleStringFlagsWithName(const char *command, const char* name, PyCompilerFlags *flags) {
 PyObject *main_module = PyImport_AddModuleRef("__main__");
 if (main_module == NULL) {
 return -1;
 }
 PyObject *dict = PyModule_GetDict(main_module); // borrowed ref

 PyObject *res = NULL;
 if (name == NULL) {
 res = PyRun_StringFlags(command, Py_file_input, dict, dict, flags);
 } else {
 PyObject* the_name = PyUnicode_FromString(name);
 if (!the_name) {
 PyErr_Print();
 return -1;
 }
 res = _PyRun_StringFlagsWithName(command, the_name, Py_file_input, dict, dict, flags, 0);
 Py_DECREF(the_name);
 }
 Py_DECREF(main_module);
 if (res == NULL) {
 PyErr_Print();
 return -1;
 }

 Py_DECREF(res);
 return 0;
}

CPython versions tested on:

CPython main branch

Operating systems tested on:

Windows

Linked PRs

• gh-146355: Fix main_module ref leak in _PyRun_SimpleStringFlagsWithName #146356