From: Peter Hurley <peter@hurleysoftware.com>
Date: Sun, 10 Jan 2016 06:55:37 +0000 (-0800)
Subject: tty: audit: Check audit enable first
X-Git-Tag: v4.14-rc1~3636^2~180
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f17c3662745ea5fd4510c3dff19f9975552e1865;p=platform%2Fkernel%2Flinux-rpi.git

tty: audit: Check audit enable first

Audit is unlikely to be enabled; check first to exit asap.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/tty_audit.c b/drivers/tty/tty_audit.c
index 6e33e41..269e41f 100644
--- a/drivers/tty/tty_audit.c
+++ b/drivers/tty/tty_audit.c
@@ -211,6 +211,10 @@ void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
 	unsigned int audit_tty;
 	dev_t dev;
 
+	audit_tty = READ_ONCE(current->signal->audit_tty);
+	if (~audit_tty & AUDIT_TTY_ENABLE)
+		return;
+
 	if (unlikely(size == 0))
 		return;
 
@@ -218,9 +222,6 @@ void tty_audit_add_data(struct tty_struct *tty, const void *data, size_t size)
 	    && tty->driver->subtype == PTY_TYPE_MASTER)
 		return;
 
-	audit_tty = READ_ONCE(current->signal->audit_tty);
-	if (~audit_tty & AUDIT_TTY_ENABLE)
-		return;
 	if ((~audit_tty & AUDIT_TTY_LOG_PASSWD) && icanon && !L_ECHO(tty))
 		return;