The REQUEST should not accept holds after it has been closed.

doc/CHANGES.txt

@@ -8,6 +8,8 @@ Zope Changes
 
     Bugs fixed
 
+      - The REQUEST no longer accepts holds after it has been closed.
+
       - Collector #1441: WebDAV compatibility with Windows Web Folders
         restored by adding a configuration variable that controls the
         sending of the non-standard MS-Author-Via and Public

lib/python/ZPublisher/BaseRequest.py

@@ -634,7 +634,8 @@ class BaseRequest:
     def _hold(self, object):
         """Hold a reference to an object to delay it's destruction until mine
         """
-        self._held=self._held+(object,)
+        if self._held is not None:
+            self._held=self._held+(object,)
 
 def exec_callables(callables):
     result = None

lib/python/ZPublisher/tests/testBaseRequest.py

@@ -247,6 +247,17 @@ class TestBaseRequest(TestCase):
         self.assertRaises(NotFound, r.traverse, 'folder/simpleSet')
         self.assertRaises(NotFound, r.traverse, 'folder/simpleFrozenSet')
 
+    def test_hold_after_close(self):
+        # Request should no longer accept holds after it has been closed
+        r = self.makeBaseRequest()
+        r._hold(lambda x: None)
+        self.assertEqual(len(r._held), 1)
+        r.close()
+        # No more holding from now on
+        self.assertEqual(r._held, None)
+        r._hold(lambda x: None)
+        self.assertEqual(r._held, None)
+
 from ZPublisher import NotFound
 
 import zope.interface