jtl 805519e47d Add some additional length checks to the IPv4 fragmentation code.
Specifically, block 0-length fragments, even when the MF bit is clear.
Also, ensure that every fragment with the MF bit clear ends at the same
offset and that no subsequently-received fragments exceed that offset.

Reviewed by:	glebius, markj
MFC after:	3 days
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D17922
2018-11-16 18:32:48 +00:00
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