linux-kernel - Re: dm: fix dax_dev NULL dereference

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Date:   Tue, 30 Jul 2019 14:38:24 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Mike Snitzer <snitzer@...hat.com>
Cc:     Pankaj Gupta <pagupta@...hat.com>,
        device-mapper development <dm-devel@...hat.com>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Alasdair Kergon <agk@...hat.com>, jencce.kernel@...il.com
Subject: Re: dm: fix dax_dev NULL dereference

On Tue, Jul 30, 2019 at 12:07 PM Mike Snitzer <snitzer@...hat.com> wrote:
>
> I staged the fix (which I tweaked) here:
> https://git.kernel.org/pub/scm/linux/kernel/git/device-mapper/linux-dm.git/commit/?h=dm-5.3&id=95b9ebb78c4c733f8912a195fbd0bc19960e726e

Thanks for picking this up Mike, but I'd prefer to just teach
dax_synchronous() to return false if the passed in dax_dev is NULL.
Thoughts?