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[3.13] gh-142831: Fix use-after-free in json encoder during re-entrant mutation (gh-142851) - #150079
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… mutation (pythongh-142851) User callbacks invoked during JSON encoding (e.g. the `default` callback or a custom string encoder) can mutate or clear the dict or sequence being encoded, invalidating borrowed references to items, keys, and values. Hold strong references unconditionally while iterating. Co-authored-by: Kumar Aditya <kumaraditya@python.org> Co-authored-by: Gregory P. Smith <greg@krypto.org> (cherry picked from commit 235fa72)
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Documentation build overview454 files changed · ± 416 modified · - 38 deleted ± Modified
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Manual backport of #142851 to 3.13 (the bot couldn't cleanly cherry-pick due to refactors in main).
The fix had to be adapted because:
Only the two UAF regression tests from the original PR were included — test_current_indent_level from the surrounding context is unrelated to this fix and would require additional 3.14-only changes.
Built --with-pydebug and ran ./python -m test test_json -v locally — all 197 tests pass.