Fix bug in marshal where bad data would cause a segfault due to

lack of an infinite recursion check.

Contributed by Damien Miller at Google.

Lib/test/test_marshal.py

@@ -220,6 +220,10 @@ class BugsTestCase(unittest.TestCase):
             except Exception:
                 pass
 
+    def test_recursion(self):
+        s = 'c' + ('X' * 4*4) + '{' * 2**20
+        self.assertRaises(ValueError, marshal.loads, s)
+
 def test_main():
     test_support.run_unittest(IntTestCase,
                               FloatTestCase,

Misc/ACKS

@@ -429,6 +429,7 @@ Dieter Maurer
 Greg McFarlane
 Michael McLay
 Gordon McMillan
+Damien Miller
 Jay T. Miller
 Chris McDonough
 Andrew McNamara

Misc/NEWS

@@ -207,6 +207,9 @@ Core and builtins
 Library
 -------
 
+- Fix bug in marshal where bad data would cause a segfault due to
+  lack of an infinite recursion check.
+
 - Removed plat-freebsd2 and plat-freebsd3 directories (and IN.py in
   the directories).