linux-kernel - [PATCH v2 13/15] tty: audit: Check audit enable first

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Message-Id: <1452408939-19380-14-git-send-email-peter@hurleysoftware.com>
Date:	Sat,  9 Jan 2016 22:55:37 -0800
From:	Peter Hurley <peter@...leysoftware.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Jiri Slaby <jslaby@...e.cz>, linux-kernel@...r.kernel.org,
	Peter Hurley <peter@...leysoftware.com>
Subject: [PATCH v2 13/15] tty: audit: Check audit enable first

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

Signed-off-by: Peter Hurley <peter@...leysoftware.com>
---
 drivers/tty/tty_audit.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

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;
 
-- 
2.7.0