linux-kernel - Re: fs: NULL deref in atime_needs

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Date:	Mon, 29 Feb 2016 17:20:53 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>, Ian Kent <raven@...maw.net>,
	Mickaël Salaün <mic@...ikod.net>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	David Howells <dhowells@...hat.com>
Subject: Re: fs: NULL deref in atime_needs_update

On Mon, Feb 29, 2016 at 04:50:31PM +0000, Al Viro wrote:

> In __d_entry_type(), you mean?  Should be, along with READ_ONCE() there.
> AFAICS, ordering shouldn't be an issue anymore...

	FWIW, I've pushed the candidate fix (including the above) into
vfs.git#for-linus; I'd prefer to wait for confirmation that dcache.c
part is sufficient to fix the problem (_without_ reordering in lookup_fast())
before sending a pull request, though.