GeezerVison is showing github.com — [3.14] gh-159739: Recheck BytesIO state after converting truncate size (GH-160190) by miss-islington · Pull Request #160385 · python/cpython
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miss-islington
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Oct 22, 2026
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A size object's index() can close a BytesIO or export its buffer after truncate() checks the stream. Continuing can dereference a cleared buffer or resize storage behind a live view. Recheck the stream state after size conversion. Backport to 3.15 and 3.14; on 3.14, put the regression test in Lib/test/test_memoryio.py.
(cherry picked from commit 8bfda55)
Co-authored-by: Jelle Zijlstra [email protected]
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…pythonGH-160190)
A size object's __index__() can close a BytesIO or export its buffer after truncate() checks the stream. Continuing can dereference a cleared buffer or resize storage behind a live view. Recheck the stream state after size conversion. Backport to 3.15 and 3.14; on 3.14, put the regression test in Lib/test/test_memoryio.py.
(cherry picked from commit 8bfda55)
Co-authored-by: Jelle Zijlstra <[email protected]>
This was referenced Oct 22, 2026
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