linux-kernel - Re: [Oops 1/2]Something wrong with copy_from

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Date:	Sat, 30 Apr 2011 08:41:51 -0400
From:	Andy Lutomirski <luto@....EDU>
To:	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	greg@...ah.com, joe@...ches.com, randy.dunlap@...cle.com,
	trivial@...nel.org
Subject: Re: [Oops 1/2]Something wrong with copy_from_user() function

On 04/30/2011 02:13 AM, Harry Wei wrote:
> Hi us,
> 	When i was compiling 2.6.38.2 kernel. Something wrong happend to me.
> It shows like following.
>
> [...]
> Warning: call to 'copy_from_user_overflow' declared with attribute warning:
> copy_from_user buffer size is not provably correct.
> [...]
>
> See http://s1202.photobucket.com/albums/bb364/harrywei/Kernel/?action=view&current=report_bug.png for details.
> 	I tried to fix this warning, but i don't know how to deal with
> it. Can anyone help me.

That's a bug (maybe) in drivers/staging/vt6656/wpactl.c, which is a 
staging driver and therefore liable to be imperfect.  You could ignore 
it or fix it and submit a patch.

(The bug isn't in copy_from_user -- it's an intentional warning in there 
to indicate that something might be wrong with the caller.)

--Andy

>
> Thanks.
> Harry Wei.

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