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[3.15] gh-159288: Avoid segfault by adding missing recursion checks when walking lazy import chains (GH-159289) - #159416
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…en walking lazy import chains (pythonGH-159289) Add missing recursion checks when walking lazy import chains `lazy import a.b.c as d` nests one placeholder per name component. lazy_import_path() and lazy_import_replay_from() recursed over that chain without a recursion check, so a very long dotted name could overflow the C stack. Raise RecursionError instead, as the rest of lazy import resolution does. (cherry picked from commit 2588362) Co-authored-by: Brittany Reynoso <breynoso@meta.com>
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October 14, 2026 13:51
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Add missing recursion checks when walking lazy import chains
lazy import a.b.c as d nests one placeholder per name component.
lazy_import_path() and lazy_import_replay_from() recursed over that
chain without a recursion check, so a very long dotted name could
overflow the C stack. Raise RecursionError instead, as the rest of
lazy import resolution does.
(cherry picked from commit 2588362)
Co-authored-by: Brittany Reynoso breynoso@meta.com