[4.9] Security fixes (pinctrl, i40e, geneve)

[Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>]

Here are backports of some fixes to the 4.9 stable branch.

I wasn't able to test the pinctrl fix (no idea how to reproduce it).

I wasn't able to test the i40e changes (no hardware and no reproducer
available).

I tested the geneve fix with libreswan as (roughly) described in the
commit message.

Ben.

-- 
Ben Hutchings, Software Developer                         Codethink Ltd
https://www.codethink.co.uk/                 Dale House, 35 Dale Street
                                     Manchester, M1 2HF, United Kingdom

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