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gh-159739: Recheck BytesIO state after converting truncate size - #160190
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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.
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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.