Fix __lazy_import__ crash

johnslavik · johnslavik · commit 5a7a4f29fcba · 2026-02-15T22:39:43.000+01:00
diff --git a/Python/import.c b/Python/import.c
@@ -4501,6 +4501,9 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,
             assert(!PyErr_Occurred());
             modname = Py_NewRef(Py_None);
         }
+        if (fromlist == NULL) {
+            fromlist = Py_NewRef(Py_None);
+        }
         PyObject *args[] = {modname, name, fromlist};
         PyObject *res = PyObject_Vectorcall(filter, args, 3, NULL);
 

Original file line number	Diff line number	Diff line change
`@@ -4501,6 +4501,9 @@ _PyImport_LazyImportModuleLevelObject(PyThreadState *tstate,`
`4501`	`4501`	`assert(!PyErr_Occurred());`
`4502`	`4502`	`modname = Py_NewRef(Py_None);`
`4503`	`4503`	`}`
	`4504`	`+ if (fromlist == NULL) {`
	`4505`	`+ fromlist = Py_NewRef(Py_None);`
	`4506`	`+ }`
`4504`	`4507`	`PyObject *args[] = {modname, name, fromlist};`
`4505`	`4508`	`PyObject *res = PyObject_Vectorcall(filter, args, 3, NULL);`
`4506`	`4509`