netdev - Re: [PATCH -net] tls: return -EFAULT if copy_to

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Message-ID: <20170623112900.nhbtfwa5mtrxtt4d@mwanda>
Date:   Fri, 23 Jun 2017 14:29:01 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Joe Perches <joe@...ches.com>
Cc:     Dave Watson <davejwatson@...com>,
        Aviad Yehezkel <aviadye@...lanox.com>,
        Ilya Lesokhin <ilyal@...lanox.com>,
        "David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH -net] tls: return -EFAULT if copy_to_user() fails

On Fri, Jun 23, 2017 at 03:58:35AM -0700, Joe Perches wrote:
> getsockopt says:
> 
> For getsockopt(), optlen is a value-result argument, initially containing the size
> of the buffer pointed to by optval, and modified on return to indicate the actual
> size of the value returned

In the original code, it's not returning the "actual size of the value
returned". It's returning a smaller or equal value... The man page is
correct that this is how some getsockopts work, of course.  But here
-EFAULT is expected.

regards,
dan carpenter