Issue #1642: Fix segfault in ctypes when trying to delete attributes.
diff --git a/Lib/ctypes/test/test_delattr.py b/Lib/ctypes/test/test_delattr.py
new file mode 100644
index 0000000..0f4d586
--- /dev/null
+++ b/Lib/ctypes/test/test_delattr.py
@@ -0,0 +1,21 @@
+import unittest
+from ctypes import *
+
+class X(Structure):
+ _fields_ = [("foo", c_int)]
+
+class TestCase(unittest.TestCase):
+ def test_simple(self):
+ self.assertRaises(TypeError,
+ delattr, c_int(42), "value")
+
+ def test_chararray(self):
+ self.assertRaises(TypeError,
+ delattr, (c_char * 5)(), "value")
+
+ def test_struct(self):
+ self.assertRaises(TypeError,
+ delattr, X(), "foo")
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/Misc/NEWS b/Misc/NEWS
index a45ac11..1599ade 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -325,6 +325,8 @@
Library
-------
+- Issue #1642: Fix segfault in ctypes when trying to delete attributes.
+
- Issue #1727780: Support loading pickles of random.Random objects created
on 32-bit systems on 64-bit systems, and vice versa. As a consequence
of the change, Random pickles created by Python 2.6 cannot be loaded
diff --git a/Modules/_ctypes/_ctypes.c b/Modules/_ctypes/_ctypes.c
index d564fb9..03e2e7a 100644
--- a/Modules/_ctypes/_ctypes.c
+++ b/Modules/_ctypes/_ctypes.c
@@ -788,6 +788,12 @@
char *ptr;
Py_ssize_t size;
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "can't delete attribute");
+ return -1;
+ }
+
if (PyUnicode_Check(value)) {
value = PyUnicode_AsEncodedString(value,
conversion_mode_encoding,
@@ -843,6 +849,11 @@
{
Py_ssize_t result = 0;
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "can't delete attribute");
+ return -1;
+ }
if (PyString_Check(value)) {
value = PyUnicode_FromEncodedObject(value,
conversion_mode_encoding,
@@ -4139,6 +4150,11 @@
PyObject *result;
StgDictObject *dict = PyObject_stgdict((PyObject *)self);
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "can't delete attribute");
+ return -1;
+ }
assert(dict); /* Cannot be NULL for CDataObject instances */
assert(dict->setfunc);
result = dict->setfunc(self->b_ptr, value, dict->size);
diff --git a/Modules/_ctypes/cfield.c b/Modules/_ctypes/cfield.c
index 77667f5..8857e44 100644
--- a/Modules/_ctypes/cfield.c
+++ b/Modules/_ctypes/cfield.c
@@ -199,6 +199,11 @@
assert(CDataObject_Check(inst));
dst = (CDataObject *)inst;
ptr = dst->b_ptr + self->offset;
+ if (value == NULL) {
+ PyErr_SetString(PyExc_TypeError,
+ "can't delete attribute");
+ return -1;
+ }
return CData_set(inst, self->proto, self->setfunc, value,
self->index, self->size, ptr);
}