Issue #24913: Fix overrun error in deque.index().
diff --git a/Lib/test/test_deque.py b/Lib/test/test_deque.py
index b858509..8718716 100644
--- a/Lib/test/test_deque.py
+++ b/Lib/test/test_deque.py
@@ -289,6 +289,11 @@
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 63b959d..64aa0e1 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,9 @@
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 830c5b8..3856d83 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -924,6 +924,8 @@
if (stop < 0)
stop = 0;
}
+ if (stop > Py_SIZE(deque))
+ stop = Py_SIZE(deque);
for (i=0 ; i<stop ; i++) {
if (i >= start) {