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GeezerVison is showing github.com — gh-156939: Clear newly allocated bytes in PyBytesWriter_Resize() by vstinner · Pull Request #157455 · python/cpython

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@vstinner

@vstinner vstinner commented Sep 13, 2026 •
edited by bedevere-app Bot
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Adjust the logic to set newly allocated bytes to a known pattern (PyBytesWrite_NEW_BYTE). Only copy 'size' bytes from the small buffer to the new bytes/bytearray object.

  • Issue: C API: Detect buffer overflow in PyBytesWriter #156939

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@vstinner
pythongh-156939: Clear newly allocated bytes in PyBytesWriter_Resize()
89057e8 
Adjust the logic to set newly allocated bytes to a known pattern
(PyBytesWrite_NEW_BYTE). Only copy 'size' bytes from the small buffer
to the new bytes/bytearray object.
@vstinner vstinner added the skip news label Sep 13, 2026
@bedevere-app bedevere-app Bot mentioned this pull request Sep 13, 2026
C API: Detect buffer overflow in PyBytesWriter #156939
Closed
@bedevere-app bedevere-app Bot added the awaiting core review label Sep 13, 2026
@vstinner
vstinner enabled auto-merge (squash) September 15, 2026 14:41
@vstinner
vstinner merged commit 3b1057d into python:main Sep 15, 2026
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@vstinner
vstinner deleted the writer_canary2 branch September 15, 2026 15:10
@bedevere-app bedevere-app Bot removed the awaiting core review label Sep 15, 2026
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@vstinner
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