linux-kernel - [PATCH AUTOSEL 4.14 70/95] vt: always call notifier with the console lock held

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Date:   Tue,  7 May 2019 01:37:59 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nicolas Pitre <nicolas.pitre@...aro.org>,
        Nicolas Pitre <nico@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 70/95] vt: always call notifier with the console lock held

From: Nicolas Pitre <nicolas.pitre@...aro.org>

[ Upstream commit 7e1d226345f89ad5d0216a9092c81386c89b4983 ]

Every invocation of notify_write() and notify_update() is performed
under the console lock, except for one case. Let's fix that.

Signed-off-by: Nicolas Pitre <nico@...aro.org>
Cc: stable@...r.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 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 1fb5e7f409c4..6ff921cf9a9e 100644
--- a/drivers/tty/vt/vt.c
+++ b/drivers/tty/vt/vt.c
@@ -2435,8 +2435,8 @@ static int do_con_write(struct tty_struct *tty, const unsigned char *buf, int co
 	}
 	con_flush(vc, draw_from, draw_to, &draw_x);
 	console_conditional_schedule();
-	console_unlock();
 	notify_update(vc);
+	console_unlock();
 	return n;
 }
 
-- 
2.20.1