off by one bounds

[Skip Ford]

Maxim Konovalov wrote:
> On Fri, 20 Aug 2004, 12:36-0700, Ted Unangst wrote:
> 
>> errors in freebsd 4.10 found by Coverity's analysis.
> 
>> ip_icmp.c:ip_next_mtu, i == sizeof, dir >= 0
> 
> If i == sizeof then mtutab[i] == 0

If "i == sizeof" then mtutab[i] is out of bounds, off by one.
There is no mtutab[sizeof mtutab / sizeof mtutab[0]].

This isn't specific to RELENG_4.

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