[Bug 218911] [uma] Memory corruption with certain item sizes

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=218911

--- Comment #3 from Mark Johnston <markj at FreeBSD.org> ---
This looks reasonable to me too.

I note that the assignment keg->uk_slabsize = keg->uk_ppera * PAGE_SIZE will
overflow when uk_ppera >= 16. This field isn't actually used after the keg is
constructed, so a different solution may be to remove uk_slabsize and make
uk_pgoff 32 bits wide.

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