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gh-131998: Fix NULL dereference when using an unbound method descriptor in a specialized code path (#132000)

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Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Victor Stinner <vstinner@python.org>
Co-authored-by: Mark Shannon <mark@hotpy.org>
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Peter Bierma 2025-04-08 06:31:43 -04:00 • committed by GitHub
parent 3eda146035
commit ac3c439cdf
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4
Python/bytecodes.c
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@ -4300,12 +4300,14 @@ dummy_func(
arguments--;
total_args++;
}
EXIT_IF(total_args == 0);
PyMethodDescrObject *method = (PyMethodDescrObject *)callable_o;
EXIT_IF(!Py_IS_TYPE(method, &PyMethodDescr_Type));
PyMethodDef *meth = method->d_method;
EXIT_IF(meth->ml_flags != (METH_FASTCALL|METH_KEYWORDS));
PyTypeObject *d_type = method->d_common.d_type;
PyObject *self = PyStackRef_AsPyObjectBorrow(arguments[0]);
assert(self != NULL);
EXIT_IF(!Py_IS_TYPE(self, d_type));
STAT_INC(CALL, hit);
int nargs = total_args - 1;
@ -4378,12 +4380,14 @@ dummy_func(
arguments--;
total_args++;
}
EXIT_IF(total_args == 0);
PyMethodDescrObject *method = (PyMethodDescrObject *)callable_o;
/* Builtin METH_FASTCALL methods, without keywords */
EXIT_IF(!Py_IS_TYPE(method, &PyMethodDescr_Type));
PyMethodDef *meth = method->d_method;
EXIT_IF(meth->ml_flags != METH_FASTCALL);
PyObject *self = PyStackRef_AsPyObjectBorrow(arguments[0]);
assert(self != NULL);
EXIT_IF(!Py_IS_TYPE(self, method->d_common.d_type));
STAT_INC(CALL, hit);
int nargs = total_args - 1;