tty: vt, fix bogus division in csi_J

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
memset-by-words.

So remove the bogus division.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Petr Písař <ppisar@redhat.com>
Fixes: f8df13e0a9 (tty: Clean console safely)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/tty/vt/vt.c b/drivers/tty/vt/vt.c
index 4df5cff..97eb987 100644 (file)
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -1197,7 +1197,7 @@ 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,
                        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);
                        set_origin(vc);
                        if (CON_IS_VISIBLE(vc))
                                update_screen(vc);