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[3.14] gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629)#143872

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vstinner merged 1 commit intopython:3.14fromvstinner:bytesio_write14
Jan 15, 2026

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@vstinnervstinner commentedJan 15, 2026•
edited by bedevere-appbot
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Fix an inconsistency issue in io.BytesIO.write() where the buffer was exported twice, which could lead to unexpected data overwrites and position drift when the buffer changes between exports.

(cherry picked from commitc461aa9)

…thon#143629)Fix an inconsistency issue in io.BytesIO.write() where the buffer was exportedtwice, which could lead to unexpected data overwrites and position drift whenthe buffer changes between exports.(cherry picked from commitc461aa9)
@vstinnervstinner merged commit1241432 intopython:3.14Jan 15, 2026
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@vstinnervstinner deleted the bytesio_write14 branchJanuary 15, 2026 16:02
@miss-islington-app
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Thanks@vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

@miss-islington-app
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Sorry,@vstinner, I could not cleanly backport this to3.13 due to a conflict.
Please backport usingcherry_picker on command line.

cherry_picker 1241432150f6342e3d38c5a80a19c8c157a4ebe8 3.13

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@vstinnervstinner removed the needs backport to 3.13bugs and security fixes labelJan 15, 2026
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GH-143878 is a backport of this pull request to the3.13 branch.

vstinner added a commit that referenced this pull requestJan 16, 2026
…143629) (#143872) (#143878)[3.14]gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629) (#143872)gh-143602: Fix duplicate buffer exports in io.BytesIO.write (#143629)Fix an inconsistency issue in io.BytesIO.write() where the buffer was exportedtwice, which could lead to unexpected data overwrites and position drift whenthe buffer changes between exports.(cherry picked from commitc461aa9)(cherry picked from commit1241432)Co-authored-by: zhong <60600792+superboy-zjc@users.noreply.github.com>
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@serhiy-storchakaserhiy-storchakaserhiy-storchaka approved these changes

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