Re: 5.9-rc7 null ptr deref in __i915_gem_userptr_get_pages_worker

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To: Jason Gunthorpe <jgg@xxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Subject: Re: 5.9-rc7 null ptr deref in __i915_gem_userptr_get_pages_worker
From: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Date: Mon, 28 Sep 2020 12:22:42 +0200
Cc: intel-gfx@xxxxxxxxxxxxxxxxxxxxx, "open list:DRM DRIVERS" <dri-devel@xxxxxxxxxxxxxxxxxxxxx>, open list <linux-kernel@xxxxxxxxxxxxxxx>, Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>, Linux-MM <linux-mm@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <CAHmME9qBtUuOSEU3Cb9rL7SHaBAwk862VEPdmYcisnSHDERtvQ@mail.gmail.com>
References: <CAHmME9odvKzyAG7HgzSE-1gLOfiU=HL1MB5w4z=AwOsjz9WJPA@mail.gmail.com> <CAHmME9qPo_MNrVioY=qgOVNxYBVY1_i_eep5wzP-7Akq5fH1Xg@mail.gmail.com> <CAHmME9qBtUuOSEU3Cb9rL7SHaBAwk862VEPdmYcisnSHDERtvQ@mail.gmail.com>

Oh, this is just a copy and paste error, when the code was originally
pasted from internal_get_user_pages_fast, which assumes a current.
I'll fix this up and send a patch shortly.

Follow-Ups:
- [PATCH] mm: do not rely on mm == current->mm in __get_user_pages_locked
  - From: Jason A. Donenfeld

References:
- Re: 5.9-rc7 null ptr deref in __i915_gem_userptr_get_pages_worker
  - From: Jason A. Donenfeld
- Re: 5.9-rc7 null ptr deref in __i915_gem_userptr_get_pages_worker
  - From: Jason A. Donenfeld

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