Repository navigation
ctypes: _Pointer.contents setter casts a __class__-spoofed value to CDataObject * #161390
Description
Bug report
Summary
Assigning to a ctypes pointer's .contents crashes the interpreter with SIGSEGV if the value is an ordinary Python object that claims to be the right type.
Expected: a TypeError, from a type check that does not consult __class__.
Reproducer
import ctypes
class Forge:
__slots__ = ("a", "b", "c", "d")
__class__ = ctypes.c_int
def __init__(self):
self.a = ctypes.c_int(7)
self.b = self.c = self.d = None
ctypes.pointer(ctypes.c_int(1)).contents = Forge()Segmentation fault (core dumped)CPython versions tested on:
3.15
Operating systems tested on:
Linux
Activity
makwana-akshat commentedon Nov 5, 2026
i would like to solve this issue. assign/
pythongh-161390: Avoid an unresolved contents reference in the NEWS e…