Index: django/contrib/admin/sites.py
===================================================================
--- django/contrib/admin/sites.py	(revision 7609)
+++ django/contrib/admin/sites.py	(working copy)
@@ -113,9 +113,13 @@
             return self.logout(request)
 
         if not self.has_permission(request):
-            return self.login(request)
-
-
+            response = self.login(request)
+            if response:
+                # make sure that there is a response before returning
+                # this addresses any post data that might persist from 
+                # expired sessions and continue through (#5999)
+                return response
+                
         if url == '':
             return self.index(request)
         elif url == 'password_change':
@@ -245,7 +249,7 @@
                         # overwrite request.POST with the saved post_data, and continue
                         request.POST = post_data
                         request.user = user
-                        return view_func(request, *args, **kwargs)
+                        return
                     else:
                         request.session.delete_test_cookie()
                         return http.HttpResponseRedirect(request.path)
Index: tests/regressiontests/admin_views/tests.py
===================================================================
--- tests/regressiontests/admin_views/tests.py	(revision 7609)
+++ tests/regressiontests/admin_views/tests.py	(working copy)
@@ -145,6 +145,16 @@
         self.failUnlessEqual(Article.objects.all().count(), 3)
         self.client.get('/test_admin/admin/logout/')
         
+        # Check and make sure that if user expires, data still persists
+        post = self.client.post('/test_admin/admin/admin_views/article/add/', add_dict)
+        self.assertContains(post, 'Please log in again, because your session has expired.')
+        self.super_login['post_data'] = _encode_post_data(add_dict)
+        post = self.client.post('/test_admin/admin/admin_views/article/add/', self.super_login)
+        self.assertRedirects(post, '/test_admin/admin/admin_views/article/')
+        self.failUnlessEqual(Article.objects.all().count(), 4)
+        self.client.get('/test_admin/admin/logout/')
+        
+        
     def testChangeView(self):
         """Change view should restrict access and allow users to edit items."""