linux-kernel - Re: [PATCH] vt: fix broken display when running aptitude

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Date:   Fri, 2 Nov 2018 15:09:14 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mikulas Patocka <mpatocka@...hat.com>
cc:     Dave Mielke <Dave@...lke.cc>, Adam Borowski <kilobyte@...band.pl>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] vt: fix broken display when running aptitude

Greg, are you picking up this patch?

Would be nice to have in v4.19.1.

On Tue, 23 Oct 2018, Nicolas Pitre wrote:

> On Tue, 23 Oct 2018, Mikulas Patocka wrote:
> 
> > If you run aptitude on framebuffer console, the display is corrupted. The 
> > corruption is caused by the commit d8ae7242. The patch adds "offset" to 
> > "start" when calling scr_memsetw, but it forgets to do the same addition 
> > on a subsequent call to do_update_region.
> > 
> > Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
> > Fixes: d8ae72427187 ("vt: preserve unicode values corresponding to screen characters")
> > Cc: stable@...r.kernel.org	# 4.19
> 
> Good catch.
> 
> Reviewed-by: Nicolas Pitre <nico@...aro.org>
> 
> > ---
> >  drivers/tty/vt/vt.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > Index: linux-2.6/drivers/tty/vt/vt.c
> > ===================================================================
> > --- linux-2.6.orig/drivers/tty/vt/vt.c	2018-10-23 16:15:08.000000000 +0200
> > +++ linux-2.6/drivers/tty/vt/vt.c	2018-10-23 16:29:20.000000000 +0200
> > @@ -1551,7 +1551,7 @@ static void csi_K(struct vc_data *vc, in
> >  	scr_memsetw(start + offset, vc->vc_video_erase_char, 2 * count);
> >  	vc->vc_need_wrap = 0;
> >  	if (con_should_update(vc))
> > -		do_update_region(vc, (unsigned long) start, count);
> > +		do_update_region(vc, (unsigned long)(start + offset), count);
> >  }
> >  
> >  static void csi_X(struct vc_data *vc, int vpar) /* erase the following vpar positions */
> > 
>