ipfilter: Add ipf_frname_vfy()
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Authored by cy on Mon, Oct 27, 11:21 PM.

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emaste
markj

Summary

ipf_frname_vfy() bounds checks fr->fr_names indicies and proceeds to
copy the interface name using FR_NAME(). The ipfilter kernel module
receives the correct inputs from the ipfilter userland tools. However
a rogue actor may call the ipfilter ioctl passing out of band data.
We need to protect ourselves from this.

Reported by: Ilja Van Sprundel <ivansprundel@ioactive.com>
MFC after: 1 week