linux-kernel - Re: [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference

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Message-ID: <8c4ca9db-70bb-b4cc-32c8-55e28b514ddd@embeddedor.com>
Date:   Tue, 18 Sep 2018 08:44:43 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Boris Brezillon <boris.brezillon@...tlin.com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Ludovic Desroches <ludovic.desroches@...rochip.com>,
        linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer
 dereference

Hi Boris,

On 9/18/18 8:40 AM, Boris Brezillon wrote:
> Hi Gustavo,
> 
> On Tue, 18 Sep 2018 08:33:17 -0500
> "Gustavo A. R. Silva" <gustavo@...eddedor.com> wrote:
> 
>> There is a potential execution path in which function
>> of_find_compatible_node() returns NULL. In such a case,
>> we end up having a NULL pointer dereference when accessing
>> pointer *nfc_np* in function of_clk_get().
>>
>> So, we better don't take any chances and fix this by null
>> checking pointer *nfc_np* before calling of_clk_get().
>>
>> Addresses-Coverity-ID: 1473052 ("Dereference null return value")
> 
> Can you add a Fixes tag here?
> 

Yep.

>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
>>  drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> index a38633a..ffa0c6b6 100644
>> --- a/drivers/mtd/nand/raw/atmel/nand-controller.c
>> +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
>> @@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
>>  	nfc_np = of_find_compatible_node(dev->of_node, NULL,
>>  					 "atmel,sama5d3-nfc");
>>  
> 
> Can you drop this blank line?
> 

OK. Sure thing.

I'll send v2 shortly.

Thanks for the feedback.
--
Gustavo