Re: [alsa-devel] [PATCH] ASoC: Intel: fix possible acpi enumeration panic

From: Kevin Strasser
Date: Mon Dec 15 2014 - 18:22:37 EST

On Mon, Dec 15, 2014 at 05:06:45PM +0000, Mark Brown 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?

That seems like a good idea to me. I'll prepare a new patch to change the
sst_machines definition so that codec_id gets initialized to NULL.

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