linux-kernel - Re: [PATCH v2] iio: proximity: as3935: fix use-after-free on device remove

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Message-ID: <20190309102427.GA3565@arch>
Date:   Sat, 9 Mar 2019 11:24:28 +0100
From:   Tomasz Duszynski <tduszyns@...il.com>
To:     Sven Van Asbroeck <thesven73@...il.com>
Cc:     Tomasz Duszynski <tduszyns@...il.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matt Ranostay <matt.ranostay@...sulko.com>
Subject: Re: [PATCH v2] iio: proximity: as3935: fix use-after-free on device
 remove

On Fri, Mar 08, 2019 at 05:46:24PM -0500, Sven Van Asbroeck wrote:
> On Fri, Mar 8, 2019 at 5:33 PM Tomasz Duszynski <tduszyns@...il.com> wrote:
> >
> >
> > So perhaps that change deserves a separate patch because it smells like
> > a code cleanup.
>
> Not really. This patch fixes the order in which resources are torn
> down on release().

What I meant is that delayed work initialization could stay where it was.
The reason you moved it is readability improvement so to me it is more
of a cleanup hence I suggested a separate patch. Up to you.

> You do this by fixing the order by which devm-resources are allocated
> on probe().
>
> So it's a fundamental use-after-free fix, and not really a cleanup.
> But I'm happy to split into multiple patches if you want ?