use after free in fork()

[Jason A. Donenfeld]

Hey guys,

I think you may have forgotten to backport this into your 16.04 hwe
kernel (and maybe others too that I haven't tried):

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2b7e8665b4ff51c034c55df3cff76518d1a9ee3a

I'm able to pretty quickly oops a kernel, and I've actually been
experiencing this in the wild on network-facing boxes when the
scheduler is under high load.

Can you patch?

Thanks,
Jason