Message-ID: <4DBC038F.3080004@mit.edu>
Date: Sat, 30 Apr 2011 08:41:51 -0400
From: Andy Lutomirski <luto@MIT.EDU>
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To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org, greg@kroah.com,
        joe@perches.com, randy.dunlap@oracle.com, trivial@kernel.org
Subject: Re: [Oops 1/2]Something wrong with copy_from_user() function
References: <20110430061336.GA4274@gmail.com>
In-Reply-To: <20110430061336.GA4274@gmail.com>
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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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