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SubjectRe: [PATCH] iio: potentiometer: ds1803: remove VLA usage
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On 03/13/2018 11:59 AM, Himanshu Jha wrote:
> On Tue, Mar 13, 2018 at 11:31:19AM -0500, Gustavo A. R. Silva wrote:
>>
>>
>> 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@embeddedor.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
>
> Updated!
>
> Also,
>
> drivers/iio/humidity/hts221_i2c.c:43:2: warning: ISO C90
> forbids variable length array ‘send’ [-Wvla]
>
> This was already removed in recent commit when regmap API was used.
>
> "6217792 iio: humidity: hts221: add regmap API support"
>
> For this I added a short note in the *Notes* column.
>

Awesome.

Thank you
--
Gustavo

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