linux-kernel - Re: [PATCH] iio: potentiometer: ds1803: remove VLA usage

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Message-ID: <be9b8f8d-929f-1c0b-334f-583d1c57460c@embeddedor.com>
Date:   Tue, 13 Mar 2018 11:31:19 -0500
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Himanshu Jha <himanshujha199640@...il.com>
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: potentiometer: ds1803: remove VLA usage



On 03/13/2018 11:24 AM, Himanshu Jha wrote:
> Hi Gustavo,
> 
> On Tue, Mar 13, 2018 at 10:23:43AM -0500, Gustavo A. R. Silva wrote:
>> In preparation to enabling -Wvla, remove VLA. In this particular
>> case use macro ARRAY_SIZE so the length of array _result_ can be
>> computed at preprocessing time.
>>
>> The use of stack Variable Length Arrays needs to be avoided, as they
>> can be a vector for stack exhaustion, which can be both a runtime bug
>> or a security flaw. Also, in general, as code evolves it is easy to
>> lose track of how big a VLA can get. Thus, we can end up having runtime
>> failures that are hard to debug.
>>
>> Also, fixed as part of the directive to remove all VLAs from
>> the kernel: https://lkml.org/lkml/2018/3/7/621
>>
>> Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
>> ---
> 
> It is already applied as I had sent the patch few days ago.
> https://lkml.org/lkml/2018/3/10/164
> 
> I specifically CC'ed you and Kees to avoid the patch collisions.
> 

I see. Can you please update this spreadsheet:

https://docs.google.com/spreadsheets/d/1OcfyKK8pJ24esYhSEsW4Q2boZE7UTGbYsSEEtFXf7U0/edit

Thanks
--
Gustavo