avoid overflow with large buffer sizes and/or offsets (closes #21831)

1 files changed, 6 insertions, 0 deletions

diff --git a/Lib/test/test_buffer.py b/Lib/test/test_buffer.py
index ac8e636..a02c5f7 100644
--- a/Lib/test/test_buffer.py
+++ b/Lib/test/test_buffer.py
@@ -4,6 +4,7 @@ For now, tests just new or changed functionality.
 
 """
 
+import sys
 import unittest
 from test import test_support
 
@@ -29,6 +30,11 @@ class BufferTests(unittest.TestCase):
         m = memoryview(b) # Should not raise an exception
         self.assertEqual(m.tobytes(), s)
 
+    def test_large_buffer_size_and_offset(self):
+        data = bytearray('hola mundo')
+        buf = buffer(data, sys.maxsize, sys.maxsize)
+        self.assertEqual(buf[:4096], "")
+
 
 def test_main():
     with test_support.check_py3k_warnings(("buffer.. not supported",