changeset:   94449:2f73de7ffcf5
branch:      3.4
parent:      94445:fb65ac5aaaac
parent:      94448:014886dae5c4
user:        Benjamin Peterson <benjamin@python.org>
date:        Sun Feb 01 21:00:15 2015 -0500
files:       Lib/test/test_itertools.py Misc/NEWS Modules/itertoolsmodule.c
description:
merge 3.3 (#23366)


diff -r fb65ac5aaaac -r 2f73de7ffcf5 Lib/test/test_itertools.py
--- a/Lib/test/test_itertools.py	Sun Feb 01 20:17:22 2015 -0500
+++ b/Lib/test/test_itertools.py	Sun Feb 01 21:00:15 2015 -0500
@@ -264,6 +264,11 @@
                 for proto in range(pickle.HIGHEST_PROTOCOL + 1):
                     self.pickletest(proto, combinations(values, r))      # test pickling
 
+    @support.bigaddrspacetest
+    def test_combinations_overflow(self):
+        with self.assertRaises(OverflowError):
+            combinations("AA", 2**29)
+
         # Test implementation detail:  tuple re-use
     @support.impl_detail("tuple reuse is specific to CPython")
     def test_combinations_tuple_reuse(self):
diff -r fb65ac5aaaac -r 2f73de7ffcf5 Misc/NEWS
--- a/Misc/NEWS	Sun Feb 01 20:17:22 2015 -0500
+++ b/Misc/NEWS	Sun Feb 01 21:00:15 2015 -0500
@@ -50,6 +50,8 @@
 Library
 -------
 
+- Issue #23366: Fixed possible integer overflow in itertools.combinations.
+
 - Issue #23369: Fixed possible integer overflow in
   _json.encode_basestring_ascii.
 
diff -r fb65ac5aaaac -r 2f73de7ffcf5 Modules/itertoolsmodule.c
--- a/Modules/itertoolsmodule.c	Sun Feb 01 20:17:22 2015 -0500
+++ b/Modules/itertoolsmodule.c	Sun Feb 01 21:00:15 2015 -0500
@@ -2359,6 +2359,10 @@
         goto error;
     }
 
+    if (r > PY_SSIZE_T_MAX/sizeof(Py_ssize_t)) {
+        PyErr_SetString(PyExc_OverflowError, "r is too big");
+        goto error;
+    }
     indices = PyMem_Malloc(r * sizeof(Py_ssize_t));
     if (indices == NULL) {
         PyErr_NoMemory();