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gh-139988: fix a leak when failing to create a Union type (#139990)

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Bénédikt Tran 2025-10-12 12:51:44 +02:00 • committed by GitHub
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Misc/NEWS.d/next/Core_and_Builtins/2025-10-12-11-00-06.gh-issue-139988.4wi51t.rst Normal file
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@ -0,0 +1,2 @@
Fix a memory leak when failing to create a :class:`~typing.Union` type.
Patch by Bénédikt Tran.

2
Objects/unionobject.c
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@ -474,11 +474,13 @@ _Py_union_from_tuple(PyObject *args)
}
if (PyTuple_CheckExact(args)) {
if (!unionbuilder_add_tuple(&ub, args)) {
unionbuilder_finalize(&ub);
return NULL;
}
}
else {
if (!unionbuilder_add_single(&ub, args)) {
unionbuilder_finalize(&ub);
return NULL;
}
}