linux-kernel - Re: [PATCH] add return value checking of get_user() in set_vesa

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Message-Id: <200611220517.kAM5HXmQ033171@mbox31.po.2iij.net>
Date:	Wed, 22 Nov 2006 14:17:33 +0900
From:	Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>
To:	Andrew Morton <akpm@...l.org>
Cc:	yoichi_yuasa@...peaks.co.jp, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] add return value checking of get_user() in
 set_vesa_blanking()

On Tue, 21 Nov 2006 17:31:15 -0800
Andrew Morton <akpm@...l.org> wrote:

> On Tue, 21 Nov 2006 14:15:28 +0900
> Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp> wrote:
> 
> > Hi,
> > 
> > This patch has added return value checking of get_user() in set_vesa_blanking().
> > 
> > Yoichi
> > 
> > Signed-off-by: Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>
> >  
> > diff -pruN -X generic/Documentation/dontdiff generic-orig/drivers/char/vt.c generic/drivers/char/vt.c
> > --- generic-orig/drivers/char/vt.c	2006-11-21 10:23:39.409667250 +0900
> > +++ generic/drivers/char/vt.c	2006-11-21 10:11:48.037209250 +0900
> > @@ -3318,9 +3318,10 @@ postcore_initcall(vtconsole_class_init);
> >  
> >  static void set_vesa_blanking(char __user *p)
> >  {
> > -    unsigned int mode;
> > -    get_user(mode, p + 1);
> > -    vesa_blank_mode = (mode < 4) ? mode : 0;
> > +	unsigned int mode;
> > +
> > +	if (!get_user(mode, p + 1))
> > +		vesa_blank_mode = (mode < 4) ? mode : 0;
> >  }
> >  
> >  void do_blank_screen(int entering_gfx)
> 
> How about we go all the way?

It's good for us.

Thanks,

Yoichi
-
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