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[3.14] gh-158928: Fix overflow in bytearray.__init__ from an iterator (GH-158947) - #161447
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…ythonGH-158947) 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. (cherry picked from commit 25181ce) Co-authored-by: Cody Maloney <cmaloney@users.noreply.github.com> Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This was referenced Nov 5, 2026
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Passing an iterator to
bytearray.__init__didn't take into accountthat iterating that iterator could modify the bytearray position and
ob_start. When that happened the iterator would write beyond the endof the allocation.
Update the "enough space" check to account for
ob_start. Theassignment always included it. Add an assert after append that the
offsets line up as expected.
(cherry picked from commit 25181ce)
Co-authored-by: Cody Maloney cmaloney@users.noreply.github.com
Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com