[Bug 209475] pf didn't check if enough free RAM for net.pf.states_hashsize

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209475

--- Comment #27 from Kristof Provost <kp at freebsd.org> ---
(In reply to fehmi noyan isi from comment #26)
Yes, your analysis looks to be correct. I'd go for the second option: try to
allocate both keyhash and idhash with the requested size. If either one fails
free both and re-try with the default size.

I don't think the sizes of the structs are relevant here. We allocate
'pf_hashsize' elements of both, but we don't care how much memory each
allocation takes, just that we know how many there are.

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