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[3.12] gh-111174: Fix crash in getbuffer() called repeatedly for empty BytesIO (GH-111210) (GH-111314)

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(cherry picked from commit 9da98c0d9a)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
This commit is contained in:
Miss Islington (bot) 2023-10-25 13:25:31 +02:00 • committed by GitHub
parent 5e94556f83
commit 45c0b38880
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3 changed files with 20 additions and 3 deletions
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14
Lib/test/test_memoryio.py
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@ -463,6 +463,20 @@ class PyBytesIOTest(MemoryTestMixin, MemorySeekTestMixin, unittest.TestCase):
memio.close()
self.assertRaises(ValueError, memio.getbuffer)
def test_getbuffer_empty(self):
memio = self.ioclass()
buf = memio.getbuffer()
self.assertEqual(bytes(buf), b"")
# Trying to change the size of the BytesIO while a buffer is exported
# raises a BufferError.
self.assertRaises(BufferError, memio.write, b'x')
buf2 = memio.getbuffer()
self.assertRaises(BufferError, memio.write, b'x')
buf.release()
self.assertRaises(BufferError, memio.write, b'x')
buf2.release()
memio.write(b'x')
def test_read1(self):
buf = self.buftype("1234567890")
self.assertEqual(self.ioclass(buf).read1(), buf)