gh-151633: avoid use-after-free in Counter.update#151634
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KowalskiThomas wants to merge 9 commits into
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gh-151633: avoid use-after-free in Counter.update#151634KowalskiThomas wants to merge 9 commits into
Counter.update#151634KowalskiThomas wants to merge 9 commits into
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eendebakpt
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Jun 18, 2026
Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
eendebakpt
reviewed
Jul 7, 2026
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Thanks for the review, I'll take a look ASAP. |
Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
eendebakpt
reviewed
Jul 10, 2026
| int found; | ||
| int cs_err = 0; | ||
| PyObject *newval = NULL; | ||
| Py_BEGIN_CRITICAL_SECTION(mapping); |
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The current PR looks good, but I think we can improve a bit more. The locking via the critical section now happens on each iteration, which seems a bit of a waste.
Can we place the critical section outside the while loop and then extract most (all?) of the code into a method _count_elements_dict_lock_held?
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Fixes #151633.
Counter.updatecan cause a use after free #151633