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

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Date:   Tue, 23 Oct 2018 11:28:28 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@...hat.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Nicolas Pitre <nicolas.pitre@...aro.org>
cc:     Dave Mielke <Dave@...lke.cc>, Adam Borowski <kilobyte@...band.pl>,
        Jiri Slaby <jslaby@...e.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] vt: fix broken display when running aptitude

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

---
 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 */