linux-kernel - Re: [PATCH 5/6] sysfs: add support for binary attributes in groups

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Message-ID: <20130711001529.GA1578@kroah.com>
Date:	Wed, 10 Jul 2013 17:15:29 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Guenter Roeck <linux@...ck-us.net>
Cc:	linux-kernel@...r.kernel.org, oliver+list@...inagl.nl,
	khali@...ux-fr.org
Subject: Re: [PATCH 5/6] sysfs: add support for binary attributes in groups

On Wed, Jul 10, 2013 at 04:59:28PM -0700, Greg Kroah-Hartman wrote:
> On Wed, Jul 10, 2013 at 04:00:57PM -0700, Guenter Roeck wrote:
> > > +	for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) {
> > 
> > What happens here if grp->bin_attrs is NULL ? Doesn't that cause a NULL
> > reference when accessing *bin_attr ?
> > 
> > [ The problem didn't exist before since attr was supposed to be non-NULL.
> >   It may now be a problem if only bin_attr is provided, ie if there are
> >   only binary attribute files.
> >   Or maybe I am just tired and there is no problem... ]
> 
> I thought I tested this patch out, but I think you are right, let me go
> do a rebuild and test it again...

You were right, good catch, as-is, the kernel dies at boot, I've fixed
this and will resend the series, thanks so much for the review.

greg k-h
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