GH-141312: Allow only integers to longrangeiter_setstate state

Lib/test/test_range.py

@@ -470,6 +470,15 @@ def test_iterator_setstate(self):
         it.__setstate__(2**64 - 7)
         self.assertEqual(list(it), [12, 10])
 
+        msg = "'float' object cannot be interpreted as an integer"
+        with self.assertRaisesRegex(TypeError, msg):
+            it = iter(range(10, 100, 2))
+            it.__setstate__(1.0)
+
+        with self.assertRaisesRegex(TypeError, msg):
+            it = iter(range(10, 2**65, 2))
+            it.__setstate__(1.0)
+
     def test_odd_bug(self):
         # This used to raise a "SystemError: NULL result without error"
         # because the range validation step was eating the exception

Objects/rangeobject.c

@@ -1063,6 +1063,12 @@ longrangeiter_setstate(PyObject *op, PyObject *state)
     PyObject *product = PyNumber_Multiply(state, r->step);
     if (product == NULL)
         return NULL;
+    if (!PyLong_Check(product)) {
+        Py_DECREF(product);
+        PyErr_Format(PyExc_TypeError,
+                     "'%T' object cannot be interpreted as an integer", state);
+        return NULL;
+    }
     PyObject *new_start = PyNumber_Add(r->start, product);
     Py_DECREF(product);
     if (new_start == NULL)