linux-kernel - Re: [PATCH v1] console: fix an issue about ioremap leak.

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Date:   Thu, 23 Apr 2020 22:29:09 +0800
From:   Dejin Zheng <zhengdejin5@...il.com>
To:     Markus Elfring <Markus.Elfring@....de>
Cc:     Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        Coccinelle <cocci@...teme.lip6.fr>, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Florian Tobias Schandinat <FlorianSchandinat@....de>,
        Ralf Bächle <ralf@...ux-mips.org>,
        Thomas Bogendörfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v1] console: fix an issue about ioremap leak.

On Thu, Apr 23, 2020 at 01:10:14PM +0200, Markus Elfring wrote:
> > if do_take_over_console() return an error in the newport_probe(),
> > due to the io virtual address is not released, it will cause a leak.
> 
> How do you think about a wording variant like the following?
> 
>    Subject:
>    [PATCH v2] console: Complete exception handling in newport_probe()
> 
>    Change description:
>    A call of the function “do_take_over_console” can fail here.
>    The corresponding system resources were not released then.
>    Thus add a call of the function “iounmap” together with the check
>    of a failure predicate.
>
Thanks!

> 
> I would like to point out that there is a script for the semantic
> patch language which would detect other questionable source code.
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/log/scripts/coccinelle/free/iounmap.cocci
> 
> How do you think about to extend presented software analysis approaches?
>
Sorry, I am not familiar with it, I don't know.

BR,
Dejin

> Regards,
> Markus