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gh-92888: Fix memoryview bad__index__ use after free#92946

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Fidget-Spinner merged 12 commits intopython:mainfromFidget-Spinner:fix_memoryview_auf
Jun 17, 2022
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Add more tests by Serhiy
Co-Authored-By: Serhiy Storchaka <3659035+serhiy-storchaka@users.noreply.github.com>
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@Fidget-Spinner@serhiy-storchaka
Fidget-Spinner andserhiy-storchaka committedMay 23, 2022
commitc818990bec7eca524a8cc6d35b859fd54f8bc303
18 changes: 18 additions & 0 deletionsLib/test/test_memoryview.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -577,6 +577,13 @@ def __bool__(self):
m = memoryview(bytearray(b'\xff'*size))
self.assertEqual(list(m[MyIndex():8]), [255] * 4)

ba = None
m = memoryview(bytearray(b'\xff'*size)).cast('B', (64, 2))
self.assertEqual(m[MyIndex(), 0], 0)
ba = None
m = memoryview(bytearray(b'\xff'*size)).cast('B', (2, 64))
self.assertEqual(m[0, MyIndex()], 0)

ba = None
m = memoryview(bytearray(b'\xff'*size))
with self.assertRaisesRegex(ValueError, "operation forbidden"):
Expand All@@ -595,6 +602,17 @@ def __bool__(self):
m[MyIndex():8] = b'spam'
self.assertEqual(ba[:8], b'\0'*8)

ba = None
m = memoryview(bytearray(b'\xff'*size)).cast('B', (64, 2))
with self.assertRaisesRegex(ValueError, "operation forbidden"):
m[MyIndex(), 0] = 42
self.assertEqual(ba[8:16], b'\0'*8)
ba = None
m = memoryview(bytearray(b'\xff'*size)).cast('B', (2, 64))
with self.assertRaisesRegex(ValueError, "operation forbidden"):
m[0, MyIndex()] = 42
self.assertEqual(ba[:8], b'\0'*8)

ba = None
m = memoryview(bytearray(b'\xff'*size))
with self.assertRaisesRegex(ValueError, "operation forbidden"):
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