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gh-158928: Fix overflow in bytearray.__init__ from an iterator - #158947
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Passing an iterator to `bytearray.__init__` didn't take into account that iterating that iterator could modify the bytearray position and `ob_start`. When that happened the iterator would write beyond the end of the allocation. Update the "enough space" check to account for `ob_start`. The assignment always included it. Add an assert after append that the offsets line up as expected. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cmaloney
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Nov 5, 2026
cmaloney
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needs backport to 3.14
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Thanks @cmaloney for the PR 🌮🎉.. I'm working now to backport this PR to: 3.14. |
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Thanks @cmaloney for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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GH-161447 is a backport of this pull request to the 3.14 branch. |
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GH-161448 is a backport of this pull request to the 3.15 branch. |
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Passing an iterator to
bytearray.__init__didn't take into account that iterating that iterator could modify the bytearray position andob_start. When that happened the iterator would write beyond the end of the allocation.Update the "enough space" check to account for
ob_start. The assignment always included it. Add an assert after append that the offsets line up as expected.