gh-157335: Fix out-of-bounds write in mmap.mmap.setitem - #157438

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python:mainfrom

Joekrry:fix-mmap-setitem-resize-reentrancy

Sep 23, 2026

Commits on Sep 13, 2026

gh-157335: Fixed out of bounds write in mmap.mmap.__setitem__. Assigning to a single index causes mmap.mmap.__setitem__ to validate the index against the object's size, which then converts the assi…
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Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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Commits on Sep 15, 2026

gh-157335: Address review feedback on mmap setitem reentrancy fix
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4095226
Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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ed62a31
gh:157335: fixed CI failure from mmap setitem reentrancy
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c9e4016
Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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b851d5f
gh:157335: mmap setitem bound checks altered, as per reviews
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c9f67ac
Merge branch 'fix-mmap-setitem-resize-reentrancy' of https://github.com/Joekrry/cpython into fix-mmap-setitem-resize-reentrancy
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2d7d2aa
Update Modules/mmapmodule.c

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vstinner
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0bc662a
Update Misc/NEWS.d/next/Library/2026-09-13-15-58-28.gh-issue-157335.efaMah.rst

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vstinner
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06d8548
Update Lib/test/test_mmap.py

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vstinner
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7de2dd3
Update Lib/test/test_mmap.py

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vstinner
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4c7991b
Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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c2cd539
gh-157335 Removed redundant CHECK_VALID check.
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11cbbe9
Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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b03446e
Merge branch 'main' into fix-mmap-setitem-resize-reentrancy
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adfc2d5