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

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Message-ID: <dc7099d8-8b36-4399-9ea0-3d1883ac35e2@redhat.com>
Date:   Sat, 2 Dec 2023 12:39:33 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Vadim Pasternak <vadimp@...dia.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Yu Sun <u202112062@...t.edu.cn>
Cc:     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,

On 11/30/23 17:24, Vadim Pasternak wrote:
> 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.

Ok, so we are going to need a v2 of this addressing Dan's remarks
about the commit message.

Yu Sun, can you please submit a new version addressing
Dan's comments on the commit message ?

Regards,

Hans