netdev - Re: [PATCH] can: mpc5xxx_can: check of

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Message-ID: <4f81e688-3d5c-6174-5a76-f416ced63cf3@pengutronix.de>
Date:   Mon, 23 Jul 2018 13:37:05 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Fabio Estevam <festevam@...il.com>,
        Nicholas Mc Guire <hofrat@...dl.org>
Cc:     Wolfram Sang <w.sang@...gutronix.de>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>, linux-can@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] can: mpc5xxx_can: check of_iomap return before use

On 07/09/2018 09:28 PM, Fabio Estevam wrote:
> On Mon, Jul 9, 2018 at 4:16 PM, Nicholas Mc Guire <hofrat@...dl.org> wrote:
>>  of_iompa() can return NULL so that return needs to be checked and NULL
> 
> s/of_iompa/of_iomap/
> 
>> treated as failure. While at it also take care of the missing
>> of_node_put() in the error path.
>>
>> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
>> Fixes: commit afa17a500a36 ("net/can: add driver for mscan family & mpc52xx_mscan")
>> ---
>>
>> Problem was found by an experimental coccinelle script
>>
>> Patch was compiletested with: mpc5200_defconfig + CONFIG_CAN=y,
>> CONFIG_CAN_MSCAN=y, CONFIG_CAN_MPC5XXX=y
>> (with a number of sparse warnings not related to the proposed change)
>>
>> Patch is against 4.18-rc3 (localversion-next is next-20180706)
>>
>>  drivers/net/can/mscan/mpc5xxx_can.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/net/can/mscan/mpc5xxx_can.c b/drivers/net/can/mscan/mpc5xxx_can.c
>> index c7427bd..2949a38 100644
>> --- a/drivers/net/can/mscan/mpc5xxx_can.c
>> +++ b/drivers/net/can/mscan/mpc5xxx_can.c
>> @@ -86,6 +86,11 @@ static u32 mpc52xx_can_get_clock(struct platform_device *ofdev,
>>                 return 0;
>>         }
>>         cdm = of_iomap(np_cdm, 0);
>> +       if (!cdm) {
>> +               of_node_put(np_cdm);
>> +               dev_err(&ofdev->dev, "can't map clock node!\n");
>> +               return 0;
> 
> I think you should return an error code here. -ENOMEM maybe?

Can you send an updated version?

Marc

-- 
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