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Date:   Tue, 23 Oct 2018 11:28:28 -0400 (EDT)
From:   Mikulas Patocka <mpatocka@redhat.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Nicolas Pitre <nicolas.pitre@linaro.org>
cc:     Dave Mielke <Dave@mielke.cc>, Adam Borowski <kilobyte@angband.pl>,
        Jiri Slaby <jslaby@suse.com>, linux-kernel@vger.kernel.org
Subject: [PATCH] vt: fix broken display when running aptitude
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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@redhat.com>
Fixes: d8ae72427187 ("vt: preserve unicode values corresponding to screen characters")
Cc: stable@vger.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 */