[PATCH 3.16 170/306] tty: vt, fix bogus division in csi_J

From: Ben Hutchings
Date: Wed Feb 15 2017 - 18:30:21 EST

3.16.40-rc1 review patch. If anyone has any objections, please let me know.


From: Jiri Slaby <jslaby@xxxxxxx>

commit 42acfc6615f47e465731c263bee0c799edb098f2 upstream.

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

So remove the bogus division.

Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
Cc: Petr PÃsaÅ <ppisar@xxxxxxxxxx>
Fixes: f8df13e0a9 (tty: Clean console safely)
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
drivers/tty/vt/vt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1164,7 +1164,7 @@ static void csi_J(struct vc_data *vc, in
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);