Do not let overflows in enumerate() and count() pass silently.
diff --git a/Objects/enumobject.c b/Objects/enumobject.c
index a8f43e0..a456c9d 100644
--- a/Objects/enumobject.c
+++ b/Objects/enumobject.c
@@ -62,6 +62,12 @@
PyObject *result = en->en_result;
PyObject *it = en->en_sit;
+ if (en->en_index == LONG_MAX) {
+ PyErr_SetString(PyExc_OverflowError,
+ "enumerate() is limited to LONG_MAX items");
+ return NULL;
+ }
+
next_item = (*it->ob_type->tp_iternext)(it);
if (next_item == NULL)
return NULL;