[PATCHv2] net: bpf: reject invalid shifts

[David Miller]

From: Alexei Starovoitov <alexei.starovoitov at gmail.com>
Date: Tue, 12 Jan 2016 18:24:16 -0800

> If anyone wants to submit a patch that masks K &= 31, I would ok
> with it as well, but imo it's a disservice to classic bpf users.

This is how I feel as well.  I hate when some developer of a tool
thinks it's ok to silently let me do something which it can strictly
determine is questionable without my explicitly asking it to do so.