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gh-160176: Fix crash in tkinter on deeply nested or recursive lists - #160177
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October 22, 2026 04:18
…ists Converting a nested list or tuple to a Tcl object now raises ValueError above 1000 levels, the same limit _flatten() uses. Converting a deeply nested Tcl list back to Python now raises RecursionError.
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Thanks @gpshead for the PR 🌮🎉.. I'm working now to backport this PR to: 3.15. |
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GH-161071 is a backport of this pull request to the 3.15 branch. |
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This change introduced a regression: #161353 "test_tcl leaked [1, 1, 1] handles on AMD64 Windows Server 2025 Refleaks 3.x". |
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…lists (GH-160177) (#161071) gh-160176: Fix crash in tkinter on deeply nested or recursive lists (GH-160177) Converting a nested list or tuple to a Tcl object now raises ValueError above 1000 levels, the same limit _flatten() uses. Converting a deeply nested Tcl list back to Python now raises RecursionError. ANT-2026-7UKC5QED (cherry picked from commit 9c0cfb1) Co-authored-by: Gregory P. Smith <68491+gpshead@users.noreply.github.com> Co-authored-by: Gregory P. Smith <greg@krypto.org>
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Pass a depth through
AsObj()/TupleAsObj()and raiseValueErrorabove 1000 levels, the same limit and exception_flatten()uses. A fixed limit rather than a C stack check, because Tcl itself recurses when it builds the string form of a nested list and can overflow at depths Python's stack check would still allow. Converted items are now released on the error path instead of leaked. The reverse direction,FromObj()on a nested Tcl list, getsPy_EnterRecursiveCall()and raisesRecursionError.Lists or tuples nested deeper than 1000 levels that happened to fit on the stack used to convert and now raise
ValueError.Fixes #160176
ANT-2026-7UKC5QED