linux-kernel - Re: [PATCH v2 2/2] nvmem: core: Expose cells through sysfs

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Date:   Thu, 1 Jun 2023 11:26:28 +0200
From:   Miquel Raynal <miquel.raynal@...tlin.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Luka Perkov <luka.perkov@...tura.hr>,
        Robert Marko <robert.marko@...tura.hr>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] nvmem: core: Expose cells through sysfs

Hi Greg,

gregkh@...uxfoundation.org wrote on Thu, 1 Jun 2023 10:03:01 +0100:

> On Thu, Jun 01, 2023 at 10:51:14AM +0200, Miquel Raynal wrote:
> > > > +	/* Without exposed cells, successfully exit after
> > > > assigning an empty attributes array */
> > > > +	if (!ncells)
> > > > +		goto unlock_mutex;  
> > > 
> > > Shouldn't this check be higher up _before_ you allocate any memory?
> > > If the attribute group list is empty, nothing should be created,
> > > right?  Or will the driver core crash?
> > 
> > As you rightfully guessed it, the core will crash if no list is
> > provided at all. I need to provide an empty list with just an empty
> > member and everything goes smoothly. 
> 
> Let's fix the core, it shouldn't crash like that :)

Perfectly fine by me, I'll give this idea a try.

Thanks,
Miquèl