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gh-146102: Avoid possibe memory leak in pylifecycle.c #151534

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Avoid possibe memory leak in `pylifecycle.c`
ByteFlowing1337 Jun 16, 2026
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ByteFlowing1337 Jun 16, 2026
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core_and_Builtins/2026-06-16-16-19-42.gh-issue-146102.xtcD4F.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Avoid possible memory leak in ``pylifecycle.c``. Patch by Ivy Xu.
30 changes: 25 additions & 5 deletions Python/pylifecycle.c
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Original file line number Diff line number Diff line change
Expand Up @@ -916,10 +916,12 @@ pycore_init_builtins(PyThreadState *tstate)
interp->callable_cache.object__getattribute__ = object__getattribute__;

if (_PyType_InitSlotDefs(interp) < 0) {
Py_XDECREF(bimod);
return _PyStatus_ERR("failed to init slotdefs");
}

if (_PyBuiltins_AddExceptions(bimod) < 0) {
Py_XDECREF(bimod);
return _PyStatus_ERR("failed to add exceptions to builtins");
}

Expand Down Expand Up @@ -1826,9 +1828,13 @@ finalize_clear_modules_dict(PyObject *modules)
PyDict_Clear(modules);
}
else {
if (PyObject_CallMethodNoArgs(modules, &_Py_ID(clear)) == NULL) {
PyObject *res = PyObject_CallMethodNoArgs(modules, &_Py_ID(clear));
if (res == NULL) {
PyErr_FormatUnraisable("Exception ignored while clearing sys.modules");
}
else {
Py_DECREF(res);
}
}
}

Expand Down Expand Up @@ -2932,6 +2938,7 @@ add_main_module(PyInterpreterState *interp)
return _PyStatus_ERR("Failed to retrieve builtins module");
}
if (PyDict_SetItemString(d, "__builtins__", bimod) < 0) {
Py_DECREF(bimod);
return _PyStatus_ERR("Failed to initialize __main__.__builtins__");
}
Py_DECREF(bimod);
Expand All @@ -2955,6 +2962,7 @@ add_main_module(PyInterpreterState *interp)
return _PyStatus_ERR("Failed to retrieve BuiltinImporter");
}
if (PyDict_SetItemString(d, "__loader__", loader) < 0) {
Py_DECREF(loader);
return _PyStatus_ERR("Failed to initialize __main__.__loader__");
}
Py_DECREF(loader);
Expand Down Expand Up @@ -3189,8 +3197,14 @@ init_sys_streams(PyThreadState *tstate)
config->stdio_errors);
if (std == NULL)
goto error;
PySys_SetObject("__stdin__", std);
_PySys_SetAttr(&_Py_ID(stdin), std);
if (PySys_SetObject("__stdin__", std) < 0) {
Py_DECREF(std);
goto error;
}
if (_PySys_SetAttr(&_Py_ID(stdin), std) < 0) {
Py_DECREF(std);
goto error;
}
Py_DECREF(std);

/* Set sys.stdout */
Expand All @@ -3200,8 +3214,14 @@ init_sys_streams(PyThreadState *tstate)
config->stdio_errors);
if (std == NULL)
goto error;
PySys_SetObject("__stdout__", std);
_PySys_SetAttr(&_Py_ID(stdout), std);
if (PySys_SetObject("__stdout__", std) < 0) {
Py_DECREF(std);
goto error;
}
if (_PySys_SetAttr(&_Py_ID(stdout), std) < 0) {
Py_DECREF(std);
goto error;
}
Py_DECREF(std);

#if 1 /* Disable this if you have trouble debugging bootstrap stuff */
Expand Down
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