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[3.10] gh-99275: Fix SystemError in ctypes during __initsubclass__ (GH-99283) #99448

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Merged
merged 1 commit into from
Nov 13, 2022
Merged

[3.10] gh-99275: Fix SystemError in ctypes during __initsubclass__ (GH-99283) #99448

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9 changes: 9 additions & 0 deletions Lib/ctypes/test/test_struct_fields.py
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,15 @@ class X(Structure):
x.char = b'a\0b\0'
self.assertEqual(bytes(x), b'a\x00###')

def test_gh99275(self):
class BrokenStructure(Structure):
def __init_subclass__(cls, **kwargs):
cls._fields_ = [] # This line will fail, `stgdict` is not ready

with self.assertRaisesRegex(TypeError,
'ctypes state is not initialized'):
class Subclass(BrokenStructure): ...

# __set__ and __get__ should raise a TypeError in case their self
# argument is not a ctype instance.
def test___set__(self):
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-11-09-12-16-35.gh-issue-99275.klOqoL.rst
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@@ -0,0 +1,2 @@
Fix ``SystemError`` in :mod:`ctypes` when exception was not set during
``__initsubclass__``.
5 changes: 4 additions & 1 deletion Modules/_ctypes/stgdict.c
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Original file line number Diff line number Diff line change
Expand Up @@ -420,8 +420,11 @@ PyCStructUnionType_update_stgdict(PyObject *type, PyObject *fields, int isStruct
}

stgdict = PyType_stgdict(type);
if (!stgdict)
if (!stgdict) {
PyErr_SetString(PyExc_TypeError,
"ctypes state is not initialized");
return -1;
}
/* If this structure/union is already marked final we cannot assign
_fields_ anymore. */

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