linux-kernel - Re: [PATCH v2 2/2] mtd: nand: atmel_nand: fix a possible NULL dereference

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Message-ID: <20151124131218.GA7545@Red>
Date:	Tue, 24 Nov 2015 14:12:18 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	Josh Wu <josh.wu@...el.com>
Cc:	computersforpeace@...il.com, dwmw2@...radead.org,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: Re: [PATCH v2 2/2] mtd: nand: atmel_nand: fix a possible NULL
 dereference

On Fri, Nov 20, 2015 at 04:33:14PM +0800, Josh Wu wrote:
> Hi, Corentin
> 
> Thanks for the patch. It looks fine to me, just one nitpick in below:
> 
> On 11/20/2015 3:45 PM, LABBE Corentin wrote:
> > of_match_device could return NULL, and so cause a NULL pointer
> > dereference later.
> >
> > Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
> > ---
> >   drivers/mtd/nand/atmel_nand.c | 5 +++--
> >   1 file changed, 3 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
> > index 475c938..7902967 100644
> > --- a/drivers/mtd/nand/atmel_nand.c
> > +++ b/drivers/mtd/nand/atmel_nand.c
> > @@ -1496,8 +1496,9 @@ static int atmel_of_init_port(struct atmel_nand_host *host,
> >   	struct atmel_nand_data *board = &host->board;
> >   	enum of_gpio_flags flags = 0;
> >   
> > -	host->caps = (struct atmel_nand_caps *)
> > -		of_match_device(atmel_nand_dt_ids, host->dev)->data;
> > +	host->caps = of_device_get_match_data(host->dev);
> > +	if (!host->caps)
> > +		return 1;
> 
> it's better to use -EINVAL here.
> 

Hello

I do that Uwe Kleine-König said to me to do in others thread:
https://lkml.org/lkml/2015/11/12/70 and https://lkml.org/lkml/2015/11/16/211

Regards

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