linux-kernel - Re: [PATCH v4 0/5] iio: fix possible race condition during access of available info lists

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Message-ID: <20241019130726.336a76d7@jic23-huawei>
Date: Sat, 19 Oct 2024 13:07:26 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Matteo Martelli <matteomartelli3@...il.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>, Michael Hennerich
 <Michael.Hennerich@...log.com>, Alisa-Dariana Roman
 <alisa.roman@...log.com>, Christian Eggers <ceggers@...i.de>, Peter Rosin
 <peda@...ntia.se>, Paul Cercueil <paul@...pouillou.net>, Sebastian Reichel
 <sre@...nel.org>, linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-mips@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [PATCH v4 0/5] iio: fix possible race condition during access
 of available info lists

On Fri, 18 Oct 2024 12:16:39 +0200
Matteo Martelli <matteomartelli3@...il.com> wrote:

> Some iio drivers currently share an available info list buffer that
> might be changed while iio core prints it to sysfs. This could cause the
> buffer shared with iio core to be corrupted. However, note that I was
> able to trigger the race condition only by adding a delay between each
> sysfs_emit_at calls in the iio_format_list() to force the concurrent
> access to the shared available list buffer.

Other than the 'rules' developing around cleanup.h usage, the series looks
good to me.  Sadly that stuff is a can of worms for the unwary (and for
various reasons the usage doc got lost so the guidance is not quite in yet)!

Jonathan