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-rw-r--r--Modules/itertoolsmodule.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/Modules/itertoolsmodule.c b/Modules/itertoolsmodule.c
index 515f3ba..194f7fb 100644
--- a/Modules/itertoolsmodule.c
+++ b/Modules/itertoolsmodule.c
@@ -533,7 +533,8 @@ teedataobject_new(PyTypeObject *type, PyObject *args, PyObject *kw)
tdo->values[i] = PyList_GET_ITEM(values, i);
Py_INCREF(tdo->values[i]);
}
- tdo->numread = len;
+ /* len <= LINKCELLS < INT_MAX */
+ tdo->numread = Py_SAFE_DOWNCAST(len, Py_ssize_t, int);
if (len == LINKCELLS) {
if (next != Py_None) {