New submission from Oren Milman:
The following code causes an assertion failure:
import ctypes
class BadStruct(ctypes.Structure):
_fields_ = []
_anonymous_ = ['foo']
foo = None
this is because MakeAnonFields() (in Modules/_ctypes/stgdict.c) goes over the
names specified in _anonymous_, and looks each name up in the class by calling
PyObject_GetAttr().
in case an attribute of such a name is found (i.e. PyObject_GetAttr()
succeeded),
MakeAnonFields() assumes that the attribute was created by MakeFields(), so it
asserts the type of the attribute is PyCField_Type.
however, PyObject_GetAttr() would succeed also in case it is a normal attribute
specified by the user, but isn't specified in _fields_, as in the code above.
in such a case, the type of the attribute is not PyCField_Type, and so the
assertion fails.
----------
components: ctypes
messages: 302331
nosy: Oren Milman
priority: normal
severity: normal
status: open
title: assertion failure in ctypes in case an _anonymous_ attr appears outside
_fields_
type: crash
versions: Python 3.7
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Python tracker <[email protected]>
<https://bugs.python.org/issue31490>
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