linux-kernel - RE: [PATCH] platform/mellanox: mlxreg-lc: Check before variable dereferenced

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Message-ID: <BN9PR12MB5381385579AF6DC7C9E63640AF82A@BN9PR12MB5381.namprd12.prod.outlook.com>
Date:   Thu, 30 Nov 2023 16:24:27 +0000
From:   Vadim Pasternak <vadimp@...dia.com>
To:     Dan Carpenter <dan.carpenter@...aro.org>,
        Yu Sun <u202112062@...t.edu.cn>
CC:     Hans de Goede <hdegoede@...hat.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>,
        "hust-os-kernel-patches@...glegroups.com" 
        <hust-os-kernel-patches@...glegroups.com>,
        Dongliang Mu <dzm91@...t.edu.cn>,
        Dan Carpenter <error27@...il.com>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] platform/mellanox: mlxreg-lc: Check before variable
 dereferenced

Hi Dan,

> -----Original Message-----
> From: Dan Carpenter <dan.carpenter@...aro.org>
> Sent: Thursday, 30 November 2023 13:47
> To: Yu Sun <u202112062@...t.edu.cn>
> Cc: Hans de Goede <hdegoede@...hat.com>; Ilpo Järvinen
> <ilpo.jarvinen@...ux.intel.com>; Mark Gross <markgross@...nel.org>; Vadim
> Pasternak <vadimp@...dia.com>; hust-os-kernel-
> patches@...glegroups.com; Dongliang Mu <dzm91@...t.edu.cn>; Dan
> Carpenter <error27@...il.com>; platform-driver-x86@...r.kernel.org; linux-
> kernel@...r.kernel.org
> Subject: Re: [PATCH] platform/mellanox: mlxreg-lc: Check before variable
> dereferenced
> 
> On Thu, Nov 30, 2023 at 05:44:07PM +0800, Yu Sun wrote:
> > there is a warning saying variable dereferenced before check
> > 'data->notifier' in line 828.
> > add "for(data->notifier)" before variable deferenced.
>        ^^^
> Should have been "if (data->notifier)".
> 
> >
> > Signed-off-by: Yu Sun <u202112062@...t.edu.cn>
> > Reviewed-by: Dongliang Mu <dzm91@...t.edu.cn>
> > Reviewed-by: Dan Carpenter <error27@...il.com>
> 
> I didn't really explicitly give a Reviewed-by tag for this patch.
> https://groups.google.com/g/hust-os-kernel-
> patches/c/c5hUaYIDcII/m/h4aFS7PkCQAJ
> I also said that I thought it looked correct but that it needed a Fixes:
> tag however the Fixes tag I suggested was wrong.
> 
> Looking at it now, the correct Fixes tag would be:
> Fixes: 1c8ee06b637f ("platform/mellanox: Remove unnecessary code")
> 
> That commit says that the NULL check is not required.  So now I'm confused.
> On the one hand, the impulse is to trust the maintainer, but on the other hand
> my review suggested that the NULL check might be required.

Yes, it indeed required.
My mistake.

Thank you for your comments.

> 
> regards,
> dan carpenter
>