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From: Pavel Machek <pavel@denx.de>
To: "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
	Sascha Hauer <kernel@pengutronix.de>,
	"open list:SERIAL DRIVERS" <linux-serial@vger.kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Jiri Slaby <jslaby@suse.com>,
	Linux LED Subsystem <linux-leds@vger.kernel.org>,
	Dan Murphy <dmurphy@ti.com>
Subject: Re: [PATCH v6 1/4] lib: new helper kstrtodev_t()
Date: Sat, 25 Apr 2020 09:07:14 +0200
Message-ID: <20200425070714.GA21938@amd> (raw)
In-Reply-To: <20200220105718.eoevd3kb63zzrotu@pengutronix.de>


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Hi!

> > > > Why simple_strto*() can't be used?
> > >
> > > I didn't really consider it, but looking in more detail I don't like it
> > > much. Without having tried it I think simple_strtoull accepts
> > > "1000000000000000000000000000000000000000000" returning some arbitrary
> > > value without an error indication.
> > 
> > So what? User has a lot of possibilities to shoot into the foot.
> > Since you interpret this as device major:minor, not founding a device
> > will be first level of error, next one when your code will try to do
> > something out of it. It shouldn't be a problem of kstrtox generic
> > helpers.
> 
> I fail to follow your argument here. In my eyes if the user writes a
> valid major:minor it should work, and if they write an invalid one this
> should result in an error and not a usage of a device that just happens
> to have the major:minor that simple_strtoull happens to return for the
> two components.

Yes please. We don't allow feet shooting where it is easy to prevent,
and that is the case here.

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  parent reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13  9:15 [PATCH v6 0/4] leds: trigger: implement a tty trigger Uwe Kleine-König
2020-02-13  9:15 ` [PATCH v6 1/4] lib: new helper kstrtodev_t() Uwe Kleine-König
2020-02-19 19:50   ` Andy Shevchenko
2020-02-20  7:49     ` Uwe Kleine-König
2020-02-20 10:22       ` Andy Shevchenko
2020-02-20 10:57         ` Uwe Kleine-König
2020-02-20 11:46           ` Andy Shevchenko
2020-02-20 11:57             ` Andy Shevchenko
2020-02-20 14:01             ` Uwe Kleine-König
2020-02-21  8:42               ` Andy Shevchenko
2020-02-21 10:53                 ` Uwe Kleine-König
2020-04-25  7:07           ` Pavel Machek [this message]
2020-02-13  9:15 ` [PATCH v6 2/4] tty: rename tty_kopen() and add new function tty_kopen_shared() Uwe Kleine-König
2020-02-19 13:21   ` Johan Hovold
2020-02-19 16:37     ` Uwe Kleine-König
2020-02-19 17:17       ` Johan Hovold
2020-02-20 11:04         ` Uwe Kleine-König
2020-02-25  8:55           ` Johan Hovold
2020-02-25  9:05             ` Uwe Kleine-König
2020-02-13  9:15 ` [PATCH v6 3/4] tty: new helper function tty_get_icount() Uwe Kleine-König
2020-02-13  9:16 ` [PATCH v6 4/4] leds: trigger: implement a tty trigger Uwe Kleine-König
2020-02-19 10:52   ` Johan Hovold
2020-02-19 11:03     ` Uwe Kleine-König
2020-02-19 11:19       ` Johan Hovold
2020-02-19 12:48         ` Johan Hovold
2020-02-19 10:40 ` [PATCH v6 0/4] " Greg Kroah-Hartman
2020-02-26 14:02   ` Pavel Machek

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