linux-kernel - [PATCH] tty: vt, fix bogus division in csi

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Message-Id: <20161003090017.16090-1-jslaby@suse.cz>
Date:   Mon,  3 Oct 2016 11:00:17 +0200
From:   Jiri Slaby <jslaby@...e.cz>
To:     gregkh@...uxfoundation.org
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiri Slaby <jslaby@...e.cz>,
        Petr Písař <ppisar@...hat.com>
Subject: [PATCH] tty: vt, fix bogus division in csi_J

In csi_J(3), the third parameter of scr_memsetw (vc_screenbuf_size) is
divided by 2 inappropriatelly. But scr_memsetw expects size, not
count, because it divides the size by 2 on its own before doing actual
memset-by-words.

So remove the bogus division.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Petr Písař <ppisar@...hat.com>
Fixes: f8df13e0a9 (tty: Clean console safely)
---
 drivers/tty/vt/vt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 6b55078bda3f..e2cad4c2ba5a 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1176,7 +1176,7 @@ static void csi_J(struct vc_data *vc, int vpar)
 			break;
 		case 3: /* erase scroll-back buffer (and whole display) */
 			scr_memsetw(vc->vc_screenbuf, vc->vc_video_erase_char,
-				    vc->vc_screenbuf_size >> 1);
+				    vc->vc_screenbuf_size);
 			set_origin(vc);
 			if (con_is_visible(vc))
 				update_screen(vc);
-- 
2.10.0