From 87674ec7d51eb99586231fbd6469b10d1f4fa111 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Wed, 26 Aug 2015 08:08:38 -0700
Subject: [PATCH] Issue #24913: Fix overrun error in deque.index().

---
 Lib/test/test_deque.py       | 5 +++++
 Misc/NEWS                    | 3 +++
 Modules/_collectionsmodule.c | 2 ++
 3 files changed, 10 insertions(+)

diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index b8585096841..87187161ab3 100644
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -289,6 +289,11 @@ class TestBasic(unittest.TestCase):
                     else:
                         self.assertEqual(d.index(element, start, stop), target)
 
+    def test_insert_bug_24913(self):
+        d = deque('A' * 3)
+        with self.assertRaises(ValueError):
+            i = d.index("Hello world", 0, 4)
+
     def test_insert(self):
         # Test to make sure insert behaves like lists
         elements = 'ABCDEFGHI'
diff --git a/Misc/NEWS b/Misc/NEWS
index 63b959d4110..64aa0e1fa7f 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,9 @@ Library
   header in part headers. Patch written by Peter Landry and reviewed by Pierre
   Quentel.
 
+- Issue #24913: Fix overrun error in deque.index().
+  Found by John Leitch and Bryce Darling.
+
 - Issue #24774: Fix docstring in http.server.test. Patch from Chiu-Hsiang Hsu.
 
 - Issue #21159: Improve message in configparser.InterpolationMissingOptionError.
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index 830c5b83ebc..3856d83fb4e 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -924,6 +924,8 @@ deque_index(dequeobject *deque, PyObject *args)
         if (stop < 0)
             stop = 0;
     }
+    if (stop > Py_SIZE(deque))
+        stop = Py_SIZE(deque);
 
     for (i=0 ; i<stop ; i++) {
         if (i >= start) {