mirror of https://github.com/python/cpython
bpo-43636: Validate the version tag in _PyType_Lookup (GH-25032)
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@ -424,7 +424,7 @@ assign_version_tag(struct type_cache *cache, PyTypeObject *type)
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if (type->tp_version_tag == 0) {
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// Wrap-around or just starting Python - clear the whole cache
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type_cache_clear(cache, 1);
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return 1;
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return 0;
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}
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bases = type->tp_bases;
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@ -3361,6 +3361,7 @@ _PyType_Lookup(PyTypeObject *type, PyObject *name)
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#if MCACHE_STATS
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cache->hits++;
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#endif
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assert(_PyType_HasFeature(type, Py_TPFLAGS_VALID_VERSION_TAG));
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return entry->value;
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}
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@ -3398,6 +3399,7 @@ _PyType_Lookup(PyTypeObject *type, PyObject *name)
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cache->misses++;
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}
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#endif
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assert(_PyType_HasFeature(type, Py_TPFLAGS_VALID_VERSION_TAG));
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Py_SETREF(entry->name, Py_NewRef(name));
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}
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return res;
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