[Python-checkins] bpo-40137: _PyType_GetModuleByDef() doesn't check tp_flags (GH-25504)
vstinner
webhook-mailer at python.org
Wed Apr 21 17:36:44 EDT 2021
https://github.com/python/cpython/commit/d4aaa34798f0dd8402f412e2aa9d6fa2d6cff5fa
commit: d4aaa34798f0dd8402f412e2aa9d6fa2d6cff5fa
branch: master
author: Victor Stinner <vstinner at python.org>
committer: vstinner <vstinner at python.org>
date: 2021-04-21T23:36:26+02:00
summary:
bpo-40137: _PyType_GetModuleByDef() doesn't check tp_flags (GH-25504)
_PyType_GetModuleByDef() no longer checks if types are heap types.
_PyType_GetModuleByDef() must only be called on a heap type created
by PyType_FromModuleAndSpec() or on its subclasses.
type_ready_mro() ensures that a static type cannot inherit from a
heap type.
files:
M Objects/typeobject.c
diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index a957c832b90bd6..ef3833155e01e1 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -3590,24 +3590,23 @@ PyObject *
_PyType_GetModuleByDef(PyTypeObject *type, struct PyModuleDef *def)
{
assert(PyType_Check(type));
- assert(type->tp_mro);
- int i;
- for (i = 0; i < PyTuple_GET_SIZE(type->tp_mro); i++) {
- PyObject *super = PyTuple_GET_ITEM(type->tp_mro, i);
- if (!PyType_HasFeature((PyTypeObject *)super, Py_TPFLAGS_HEAPTYPE)) {
- /* Currently, there's no way for static types to inherit
- * from heap types, but to allow that possibility,
- * we `continue` rather than `break`.
- * We'll just potentially loop a few more times before throwing
- * the error.
- */
- continue;
- }
+ PyObject *mro = type->tp_mro;
+ assert(mro != NULL);
+ for (Py_ssize_t i = 0; i < PyTuple_GET_SIZE(mro); i++) {
+ PyObject *super = PyTuple_GET_ITEM(mro, i);
+ // _PyType_GetModuleByDef() must only be called on a heap type created
+ // by PyType_FromModuleAndSpec() or on its subclasses.
+ // type_ready_mro() ensures that a static type cannot inherit from a
+ // heap type.
+ assert(_PyType_HasFeature((PyTypeObject *)type, Py_TPFLAGS_HEAPTYPE));
+
PyHeapTypeObject *ht = (PyHeapTypeObject*)super;
- if (ht->ht_module && PyModule_GetDef(ht->ht_module) == def) {
- return ht->ht_module;
+ PyObject *module = ht->ht_module;
+ if (module && PyModule_GetDef(module) == def) {
+ return module;
}
}
+
PyErr_Format(
PyExc_TypeError,
"_PyType_GetModuleByDef: No superclass of '%s' has the given module",
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