python · tonybaloney · Apr 8, 2019 · Apr 8, 2019 · zooba · Apr 12, 2019
diff --git a/Misc/NEWS.d/next/Core and Builtins/2019-04-08-04-45-02.bpo-36552.X5p6-M.rst b/Misc/NEWS.d/next/Core and Builtins/2019-04-08-04-45-02.bpo-36552.X5p6-M.rst
@@ -0,0 +1 @@
+Calculating the length of range objects whose length is larger than PY_SIZE_MAX will now raise a ValueError instead of an OverflowError.
diff --git a/Objects/rangeobject.c b/Objects/rangeobject.c
@@ -212,7 +212,13 @@ compute_range_length(PyObject *start, PyObject *stop, PyObject *step)
 static Py_ssize_t
 range_length(rangeobject *r)
 {
-    return PyLong_AsSsize_t(r->length);
+    Py_ssize_t size = PyLong_AsSsize_t(r->length);
+    if (size < 0 && PyErr_Occurred() && PyErr_ExceptionMatches(PyExc_OverflowError)) {
+        PyErr_Clear();
+        PyErr_Format(PyExc_ValueError, "Range object too large to calculate length (Overflow Error)");
+        return -1;
+    }
+    return size;
 }
 
 static PyObject *
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		Calculating the length of range objects whose length is larger than PY_SIZE_MAX will now raise a ValueError instead of an OverflowError.