Fix SF #749831, copy raises SystemError when getstate raises exception

Lib/test/test_copy.py

@@ -515,6 +515,12 @@ class TestCopy(unittest.TestCase):
         self.assert_(x is not y)
         self.assert_(x[0] is not y[0])
 
+    def test_getstate_exc(self):
+        class EvilState(object):
+            def __getstate__(self):
+                raise ValueError, "ain't got no stickin' state"
+        self.assertRaises(ValueError, copy.copy, EvilState())
+
 def test_main():
     test_support.run_unittest(TestCopy)
 

Objects/typeobject.c

@@ -2536,6 +2536,8 @@ reduce_2(PyObject *obj)
 	if (getstate != NULL) {
 		state = PyObject_CallObject(getstate, NULL);
 		Py_DECREF(getstate);
+		if (state == NULL)
+			goto end;
 	}
 	else {
 		state = PyObject_GetAttrString(obj, "__dict__");