GeezerVison is showing github.com — [3.13] gh-143378: Fix use-after-free when BytesIO is concurrently mutated during write operations (GH-143408) by serhiy-storchaka · Pull Request #143600 · python/cpython
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serhiy-storchaka
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Jan 9, 2026
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PyObject_GetBuffer() can execute user code (e.g. via buffer), which may close or otherwise mutate a BytesIO object while write() or writelines() is in progress. This could invalidate the internal buffer and lead to a use-after-free.
Ensure that PyObject_GetBuffer() is called before validation checks. (cherry picked from commit 6d54b6a)
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…ly mutated during write operations (pythonGH-143408)
PyObject_GetBuffer() can execute user code (e.g. via __buffer__), which may
close or otherwise mutate a BytesIO object while write() or writelines()
is in progress. This could invalidate the internal buffer and lead to a
use-after-free.
Ensure that PyObject_GetBuffer() is called before validation checks.
(cherry picked from commit 6d54b6a)
Co-authored-by: zhong <[email protected]>
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