lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
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

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |



Download attachment "signature.asc" of type "application/pgp-signature" (489 bytes)

Powered by blists - more mailing lists