linux-kernel - Re: [PATCH 1/2] staging: vc04_services: Fix unportable cast in vchiq_copy_from

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Message-ID: <20161024113601.GL4418@mwanda>
Date:   Mon, 24 Oct 2016 14:36:01 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Michael Zoran <mzoran@...wfest.net>
Cc:     gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
        daniels@...labora.com, linux-kernel@...r.kernel.org,
        eric@...olt.net, noralf@...nnes.org, popcornmix@...il.com
Subject: Re: [PATCH 1/2] staging: vc04_services: Fix unportable cast in
 vchiq_copy_from_user

On Mon, Oct 24, 2016 at 04:09:37AM -0700, Michael Zoran wrote:
> I didn't think it looked totally correct, but I'm not sure it's any
> more broken then what is already in the tree.

It's not more broken.  But better to leave the compile warning there to
mark that it is an obvious security problem.

> 
> If you can kindly point me to some other source code or documentation
> to look at that is correct, I'm more then willing to fix the patch.
> 

I was hoping the maintainers could chip in, because I didn't want to
look at the code.  We really need to track which are use pointers and
which are kernel pointers.  We can't mix them like this.

regards,
dan carpenter