Apply "x86/mm: fix use-after-free of vma during userfaultfd fault" to 4.9-stable

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Subject: Apply "x86/mm: fix use-after-free of vma during userfaultfd fault" to 4.9-stable
From: Eric Biggers <ebiggers3@xxxxxxxxx>
Date: Mon, 27 Nov 2017 00:03:43 -0800
Cc: Vlastimil Babka <vbabka@xxxxxxx>, Dmitry Vyukov <dvyukov@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>, Andrea Arcangeli <aarcange@xxxxxxxxxx>, Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.9.1 (2017-09-22)

Commit cb0631fd3cf9 ("x86/mm: fix use-after-free of vma during userfaultfd
fault") went into mainline without Cc: stable.  It appears to be a
use-after-free reachable by unprivileged users -- at least with
CONFIG_USERFAULTFD=y.  Can it please be applied to 4.9-stable?

Eric

Follow-Ups:
- Re: Apply "x86/mm: fix use-after-free of vma during userfaultfd fault" to 4.9-stable
  - From: Vlastimil Babka
- Re: Apply "x86/mm: fix use-after-free of vma during userfaultfd fault" to 4.9-stable
  - From: Greg Kroah-Hartman

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