Issue #23985: Fixed integer overflow in iterator object. Original patch by

Clement Rouault.

Misc/ACKS

@@ -1159,6 +1159,7 @@ Guido van Rossum
 Just van Rossum
 Hugo van Rossum
 Saskia van Rossum
+Clement Rouault
 Donald Wallace Rouse II
 Liam Routt
 Todd Rovito

Misc/NEWS

@@ -10,6 +10,9 @@ What's New in Python 2.7.11?
 Core and Builtins
 -----------------
 
+- Issue #23985: Fixed integer overflow in iterator object.  Original patch by
+  Clement Rouault.
+
 - Issue #24102: Fixed exception type checking in standard error handlers.
 
 Library

Objects/iterobject.c

@@ -54,6 +54,11 @@ iter_iternext(PyObject *iterator)
     seq = it->it_seq;
     if (seq == NULL)
         return NULL;
+    if (it->it_index == LONG_MAX) {
+        PyErr_SetString(PyExc_OverflowError,
+                        "iter index too large");
+        return NULL;
+    }
 
     result = PySequence_GetItem(seq, it->it_index);
     if (result != NULL) {