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[3.14] gh-144100: Fix crash for POINTER(str) used in ctypes argtypes (GH-144108) #144244

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Merged
vstinner merged 1 commit into from
Jan 26, 2026
+20 −1
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[3.14] gh-144100: Fix crash for POINTER(str) used in ctypes argtypes (GH-144108) #144244

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gh-144100: Fix crash for POINTER(str) used in ctypes argtypes (GH-144108 
)

(cherry picked from commit 8f45925)

Co-authored-by: VanshAgarwal24036 <[email protected]>
Co-authored-by: Victor Stinner <[email protected]>
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@VanshAgarwal24036 @vstinner @miss-islington
2 people authored and miss-islington committed Jan 26, 2026
commit 5d3553fd9b4c0521900aa53d047e3e543f358e7b
10 changes: 10 additions & 0 deletions Lib/test/test_ctypes/test_pointers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -403,6 +403,16 @@ class Cls(Structure):
self.assertEqual(len(ws_typ), 0, ws_typ)
self.assertEqual(len(ws_ptr), 0, ws_ptr)

def test_pointer_proto_missing_argtypes_error(self):
class BadType(ctypes._Pointer):
# _type_ is intentionally missing
pass

func = ctypes.pythonapi.Py_GetVersion
func.argtypes = (BadType,)

with self.assertRaises(ctypes.ArgumentError):
func(object())

class PointerTypeCacheTestCase(unittest.TestCase):
# dummy tests to check warnings and base behavior
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2026-01-21-19-39-07.gh-issue-144100.hLMZ8Y.rst
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@@ -0,0 +1,3 @@
Fixed a crash in ctypes when using a deprecated ``POINTER(str)`` type in
``argtypes``. Instead of aborting, ctypes now raises a proper Python
exception when the pointer target type is unresolved.
8 changes: 7 additions & 1 deletion Modules/_ctypes/_ctypes.c
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Expand Up @@ -1413,7 +1413,13 @@ PyCPointerType_from_param_impl(PyObject *type, PyTypeObject *cls,
/* If we expect POINTER(<type>), but receive a <type> instance, accept
it by calling byref(<type>).
*/
assert(typeinfo->proto);
if (typeinfo->proto == NULL) {
PyErr_SetString(
PyExc_TypeError,
"cannot convert argument: POINTER _type_ type is not set"
);
return NULL;
}
switch (PyObject_IsInstance(value, typeinfo->proto)) {
case 1:
Py_INCREF(value); /* _byref steals a refcount */
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