kp's and mem corruption?

[Jason A. Donenfeld]

Hey again,

Thanks for the .ko you sent me. That was helpful in tracking down the
bug, which Matt and I have now fixed here:

https://git.zx2c4.com/wireguard-freebsd/commit/?id=c69fb61b94341027ea3c539bcf96d9fe03f65fa5

The commit message includes a little bash reproducer that hit the same
crash in my tests, making me somewhat confident we squashed the right
one.

Jason