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bpo-34784: Implement correct cleanup in PyStructSequence new implementation (GH-10536)

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PyTuple_Pack can fail and return NULL. If this happens, then PyType_FromSpecWithBases will incorrectly create a new type without bases. Also, it will crash on the Py_DECREF that follows. Also free members and type in error conditions.
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Pablo Galindo 2018-11-15 02:03:57 +00:00 • committed by GitHub
parent 4c596d54aa
commit bfb855bef6
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1 changed files with 5 additions and 0 deletions
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5
Objects/structseq.c
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@ -447,6 +447,10 @@ PyStructSequence_NewType(PyStructSequence_Desc *desc)
spec.slots = slots;
bases = PyTuple_Pack(1, &PyTuple_Type);
if (bases == NULL) {
PyMem_FREE(members);
return NULL;
}
type = (PyTypeObject *)PyType_FromSpecWithBases(&spec, bases);
Py_DECREF(bases);
PyMem_FREE(members);
@ -456,6 +460,7 @@ PyStructSequence_NewType(PyStructSequence_Desc *desc)
if (initialize_structseq_dict(
desc, type->tp_dict, n_members, n_unnamed_members) < 0) {
Py_DECREF(type);
return NULL;
}