releases/4.20.6/vt-always-call-notifier-with-the-console-lock-held.patch

   1 From 7e1d226345f89ad5d0216a9092c81386c89b4983 Mon Sep 17 00:00:00 2001
   2 From: Nicolas Pitre <nicolas.pitre@linaro.org>
   3 Date: Tue, 8 Jan 2019 22:55:00 -0500
   4 Subject: vt: always call notifier with the console lock held
   5
   6 From: Nicolas Pitre <nicolas.pitre@linaro.org>
   7
   8 commit 7e1d226345f89ad5d0216a9092c81386c89b4983 upstream.
   9
  10 Every invocation of notify_write() and notify_update() is performed
  11 under the console lock, except for one case. Let's fix that.
  12
  13 Signed-off-by: Nicolas Pitre <nico@linaro.org>
  14 Cc: stable@vger.kernel.org
  15 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  16
  17 ---
  18  drivers/tty/vt/vt.c |    2 +-
  19  1 file changed, 1 insertion(+), 1 deletion(-)
  20
  21 --- a/drivers/tty/vt/vt.c
  22 +++ b/drivers/tty/vt/vt.c
  23 @@ -2764,8 +2764,8 @@ rescan_last_byte:
  24         con_flush(vc, draw_from, draw_to, &draw_x);
  25         vc_uniscr_debug_check(vc);
  26         console_conditional_schedule();
  27 -       console_unlock();
  28         notify_update(vc);
  29 +       console_unlock();
  30         return n;
  31  }
  32