Fix a possible crash due to PyType_FromSpecWithBases() (GH-10304)

If the PyObject_MALLOC() call failed in PyType_FromSpecWithBases(),
PyObject_Free() would be called on a static string in type_dealloc().

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index eeaae1f9f789475c68a54c7a1dab22ad8bc0aaf1..b28f494962ecbd30e00b5276233ede33adc25cbc 100644 (file)
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -2995,6 +2995,7 @@ PyType_FromSpecWithBases(PyType_Spec *spec, PyObject *bases)
             size_t len = strlen(old_doc)+1;
             char *tp_doc = PyObject_MALLOC(len);
             if (tp_doc == NULL) {
+                type->tp_doc = NULL;
                 PyErr_NoMemory();
                 goto fail;
             }