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GeezerVison is showing github.com — gh-159739: Keep SimpleQueue valid after buffer allocation fails by jelle-openai · Pull Request #160165 · python/cpython

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@jelle-openai

@jelle-openai jelle-openai commented Oct 22, 2026 •
edited by bedevere-app Bot
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If allocating a SimpleQueue buffer fails, the partially constructed object reports nonzero capacity despite having no storage. A subclass finalizer that calls put() then writes through a NULL pointer and crashes; publish the capacity only after allocation succeeds. Backport to 3.15 and 3.14.

  • Issue: Fix minor safety issues #159739

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@jelle-openai
pythongh-159739: Keep SimpleQueue valid after buffer allocation fails
6f6435b 
If allocating a SimpleQueue buffer fails, the partially constructed object reports nonzero capacity despite having no storage. A subclass finalizer that calls put() then writes through a NULL pointer and crashes; publish the capacity only after allocation succeeds. Backport to 3.15 and 3.14.
@bedevere-app bedevere-app Bot mentioned this pull request Oct 22, 2026
Fix minor safety issues #159739
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@bedevere-app bedevere-app Bot added the awaiting review label Oct 22, 2026
@JelleZijlstra
JelleZijlstra merged commit 5ce1ef3 into python:main Oct 22, 2026
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@bedevere-app bedevere-app Bot removed the awaiting review label Oct 22, 2026
@JelleZijlstra JelleZijlstra added needs backport to 3.14 bugs and security fixes needs backport to 3.15 bugs and security fixes labels Oct 22, 2026
@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.14.
🐍🍒⛏🤖
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@miss-islington-app

miss-islington-app Bot commented Oct 22, 2026

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Thanks @jelle-openai for the PR, and @JelleZijlstra for merging it 🌮🎉.. I'm working now to backport this PR to: 3.15.
🐍🍒⛏🤖
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@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160287 is a backport of this pull request to the 3.14 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.14 bugs and security fixes label Oct 22, 2026
@bedevere-app

bedevere-app Bot commented Oct 22, 2026

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GH-160288 is a backport of this pull request to the 3.15 branch.
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@bedevere-app bedevere-app Bot removed the needs backport to 3.15 bugs and security fixes label Oct 22, 2026
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
@miss-islington @jelle-openai
[3.14] gh-159739: Keep SimpleQueue valid after buffer allocation fails (
7d9c808 
GH-160165) (#160287)

If allocating a SimpleQueue buffer fails, the partially constructed object reports nonzero capacity despite having no storage. A subclass finalizer that calls put() then writes through a NULL pointer and crashes; publish the capacity only after allocation succeeds. Backport to 3.15 and 3.14.
(cherry picked from commit 5ce1ef3)

Co-authored-by: Jelle Zijlstra <[email protected]>
JelleZijlstra pushed a commit that referenced this pull request Oct 22, 2026
@miss-islington @jelle-openai
[3.15] gh-159739: Keep SimpleQueue valid after buffer allocation fails (
23ac9a8 
GH-160165) (#160288)

If allocating a SimpleQueue buffer fails, the partially constructed object reports nonzero capacity despite having no storage. A subclass finalizer that calls put() then writes through a NULL pointer and crashes; publish the capacity only after allocation succeeds. Backport to 3.15 and 3.14.
(cherry picked from commit 5ce1ef3)

Co-authored-by: Jelle Zijlstra <[email protected]>
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@jelle-openai @JelleZijlstra
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