linux-kernel - Re: [PATCH] ASoC: Intel: fix possible acpi enumeration panic

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Message-ID: <20141215170645.GH11764@sirena.org.uk>
Date:	Mon, 15 Dec 2014 17:06:45 +0000
From:	Mark Brown <broonie@...nel.org>
To:	"Strasser, Kevin" <kevin.strasser@...el.com>
Cc:	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	"Koul, Vinod" <vinod.koul@...el.com>,
	"Lin, Mengdong" <mengdong.lin@...el.com>,
	"Fang, Yang A" <yang.a.fang@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: Intel: fix possible acpi enumeration panic

On Thu, Dec 11, 2014 at 09:55:38PM +0000, Strasser, Kevin wrote:

Please fix your mailer to word wrap comfortably under 80 colums so that
your mails are easily legible.

> > This changes the check from verifying if a codec_id is present to verifying if
> > the first character in the codec_id is non-NULL.  That doesn't seem obviously
> > safer and the tables of machines seem to be terminated by having an entry
> > with all fields set to zero (which is a common idiom in Linux) which would
> > now crash with this change.

> In this case mach->codec_id is non-NULL, even for the terminating element, because it
> is defined to be a fixed width. So we have to take a look at the first character to see if it
> has been initialized.

That's a really unusual and (as you've seen) error prone idiom - is it
not better to fix the struct to use the more common idiom?

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