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Date: Sun, 27 Sep 2026 18:20:01 +0100
From: Jonathan Cameron <jic23@kernel.org>
To: "Uwe =?UTF-8?B?S2xlaW5lLUvDtm5pZw==?= (The Capable Hub)"
 <u.kleine-koenig@baylibre.com>
Cc: Jiale Yao <yaojiale02@163.com>, Nuno =?UTF-8?B?U8Oh?=
 <nuno.sa@analog.com>, Michael Hennerich <Michael.Hennerich@analog.com>,
 Rodrigo Alencar <rodrigo.alencar@analog.com>, David Lechner
 <dlechner@baylibre.com>, Andy Shevchenko <andy@kernel.org>, Anshul Dalal
 <anshulusr@gmail.com>, Antoniu Miclaus <antoniu.miclaus@analog.com>, Herve
 Codina <herve.codina@bootlin.com>, Shi Hao <i.shihao.999@gmail.com>, Linus
 Walleij <linusw@kernel.org>, Krzysztof Kozlowski <krzk@kernel.org>, Angel
 Iglesias <ang.iglesiasg@gmail.com>, linux@analog.com,
 linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/7] iio: validate SPI match data before use
Message-ID: <20260927182001.10c331dd@jic23-hlaptop>
In-Reply-To: <ardhvKaSdYh2HiS6@monoceros>
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On Sat, 26 Sep 2026 08:13:13 +0200
Uwe Kleine-K=C3=B6nig (The Capable Hub) <u.kleine-koenig@baylibre.com> wrot=
e:

> Hello Jonathan,
>=20
> On Sat, Sep 26, 2026 at 02:11:43AM +0100, Jonathan Cameron wrote:
> > On Fri, 25 Sep 2026 21:17:29 +0800
> > Jiale Yao <yaojiale02@163.com> wrote:
> >  =20
> > > SPI driver_override can bind a device without a matching entry in the
> > > driver's ID tables.  spi_get_device_match_data() then returns NULL.
> > >=20
> > > These seven IIO drivers use that result without checking it, causing a
> > > NULL pointer dereference during probe.  Add the missing checks before
> > > the match data is used. =20
> >=20
> > I was hoping we'd close this finally by adding a flag to the
> > drivers to say they should fail a match if driver_override is set.
> > Given I thought maybe that would happen when Andy looked into this
> > a while back I've been sitting on this problem for a while.
> >=20
> >=20
> > Unfortunately seems we have to carry on papering over it in the
> > drivers for now :( =20
>=20
> Note there is another effort:
> https://lore.kernel.org/lkml/20260922-driver-override-opt-out-v1-0-58c35d=
ed3b83@nvidia.com/

Nice. I look forward to ripping all these checks out again
if that lands. Obviously we won't backport doing that given the checks
will remain harmless.

Jonathan

>=20
> Best regards
> Uwe