Issue #16445: Fix potential segmentation fault when deleting an exception message.
diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
index 2160641..a485cba 100644
--- a/Lib/test/test_exceptions.py
+++ b/Lib/test/test_exceptions.py
@@ -479,6 +479,18 @@
except AssertionError as e:
self.assertEqual(str(e), "(3,)")
+ def test_bad_exception_clearing(self):
+ # See issue 16445: use of Py_XDECREF instead of Py_CLEAR in
+ # BaseException_set_message gave a possible way to segfault the
+ # interpreter.
+ class Nasty(str):
+ def __del__(message):
+ del e.message
+
+ e = ValueError(Nasty("msg"))
+ e.args = ()
+ del e.message
+
# Helper class used by TestSameStrAndUnicodeMsg
class ExcWithOverriddenStr(Exception):