netdev - Re: [net 3/6] net/mlx5: FPGA, return -EINVAL if size is zero

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Message-ID: <CAJ3xEMhQGJacZS6heo-CexZGNWWAe3V4KYakQaoUJd5Xfe3t7A@mail.gmail.com>
Date:   Thu, 9 Nov 2017 18:13:51 +0900
From:   Or Gerlitz <gerlitz.or@...il.com>
To:     Kamal Heib <kamalh@...lanox.com>
Cc:     Saeed Mahameed <saeedm@...lanox.com>,
        Linux Netdev List <netdev@...r.kernel.org>,
        David Miller <davem@...emloft.net>,
        Yevgeny Kliteynik <kliteyn@...lanox.com>
Subject: Re: [net 3/6] net/mlx5: FPGA, return -EINVAL if size is zero

On Thu, Nov 9, 2017 at 4:43 PM, Kamal Heib <kamalh@...lanox.com> wrote:
> On Wed, 2017-11-08 at 23:13 +0900, Or Gerlitz wrote:
>> On Wed, Nov 8, 2017 at 4:21 PM, Saeed Mahameed <saeedm@...lanox.com>
>> wrote:
>> > From: Kamal Heib <kamalh@...lanox.com>
>> >
>> > In the current code, if a size of zero is passed to
>> > mlx5_fpga_mem_{read|write}_i2c() functions the "err"
>>
>> Don't we need to fix the call site where zero size is provided and
>> not
>> in called function?
>>
> Isn't sending down a zero size a sign for a bug which we are not
> fixing?
>>
> Both functions are called from an exported symbols. so I think the size
> validation should be within this two functions just like the case of
> checking that mdev isn't set.

Note that the kernel trust model doesn't enforce you to check
everything as you go.