bpo-31752: Fix possible crash in timedelta constructor called with custom integers. (#3947)
Bad remainder in divmod() in intermediate calculations caused an assertion failure.
diff --git a/Lib/test/datetimetester.py b/Lib/test/datetimetester.py
index a042efd..4edfb42 100644
--- a/Lib/test/datetimetester.py
+++ b/Lib/test/datetimetester.py
@@ -886,6 +886,26 @@
with self.assertRaises(ValueError):
timedelta() * get_bad_float(bad_ratio)
+ def test_issue31752(self):
+ # The interpreter shouldn't crash because divmod() returns negative
+ # remainder.
+ class BadInt(int):
+ def __mul__(self, other):
+ return Prod()
+
+ class Prod:
+ def __radd__(self, other):
+ return Sum()
+
+ class Sum(int):
+ def __divmod__(self, other):
+ # negative remainder
+ return (0, -1)
+
+ timedelta(microseconds=BadInt(1))
+ timedelta(hours=BadInt(1))
+ timedelta(weeks=BadInt(1))
+
#############################################################################
# date tests