linux-kernel - Re: [PATCH] pinctrl:sunplus: Add check for kmalloc

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Date:   Tue, 23 May 2023 22:37:15 +0300
From:   andy.shevchenko@...il.com
To:     Wells Lu 呂芳騰 <wells.lu@...plus.com>
Cc:     "andy.shevchenko@...il.com" <andy.shevchenko@...il.com>,
        Wells Lu <wellslutw@...il.com>,
        "linus.walleij@...aro.org" <linus.walleij@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] pinctrl:sunplus: Add check for kmalloc

Tue, May 23, 2023 at 05:39:51PM +0000, Wells Lu 呂芳騰 kirjoitti:
> > > Fix Smatch static checker warning:
> > > potential null dereference 'configs'. (kmalloc returns null)

...

> > >  			configs = kmalloc(sizeof(*configs), GFP_KERNEL);
> > > +			if (!configs)
> > 
> > > +				return -ENOMEM;
> > 
> > "Fixing" by adding a memory leak is not probably a good approach.
> 
> Do you mean I need to free all memory which are allocated in this subroutine before
> return -ENOMEM?

This is my understanding of the code. But as I said... (see below)

...

> > >  			configs = kmalloc(sizeof(*configs), GFP_KERNEL);
> > > +			if (!configs)
> > > +				return -ENOMEM;
> > 
> > Ditto.

...

> > It might be that I'm mistaken. In this case please add an explanation why in the commit
> > message.

^^^

-- 
With Best Regards,
Andy Shevchenko