[Bug 200323] BPF userland misuse can crash the system

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200323

--- Comment #4 from Franco Fichtner <franco at opnsense.org> ---
la is being read and modified after unlock with the attached patch.  Though it
looks like arprequest() may indeed work as expected without the lock held.  Not
sure if unlock/lock around arprequest is advisable; there may be a more
fundamental issue with the code block itself?

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