linux-kernel - [PATCH 3/12] tty: Fix the locking for signal->session in disassociate

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Message-Id: <1166008077979-git-send-email-ebiederm@xmission.com>
Date:	Wed, 13 Dec 2006 04:07:47 -0700
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	"<Andrew Morton" <akpm@...l.org>
Cc:	<containers@...ts.osdl.org>, Oleg Nesterov <oleg@...sign.ru>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	<linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 3/12] tty: Fix the locking for signal->session in disassociate_ctty

commit 24ec839c431eb79bb8f6abc00c4e1eb3b8c4d517 while fixing
the locking for signal->tty got the locking wrong for
signal->session.  This places our accesses of signal->session
back under the tasklist_lock where they belong.

Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
---
 drivers/char/tty_io.c |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index acb2f5d..628925e 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1496,7 +1496,6 @@ void disassociate_ctty(int on_exit)
 {
 	struct tty_struct *tty;
 	int tty_pgrp = -1;
-	int session;
 
 	lock_kernel();
 
@@ -1530,7 +1529,6 @@ void disassociate_ctty(int on_exit)
 
 	spin_lock_irq(&current->sighand->siglock);
 	current->signal->tty_old_pgrp = 0;
-	session = process_session(current);
 	spin_unlock_irq(&current->sighand->siglock);
 
 	mutex_lock(&tty_mutex);
@@ -1549,7 +1547,7 @@ void disassociate_ctty(int on_exit)
 
 	/* Now clear signal->tty under the lock */
 	read_lock(&tasklist_lock);
-	session_clear_tty(session);
+	session_clear_tty(process_session(current));
 	read_unlock(&tasklist_lock);
 	unlock_kernel();
 }
-- 
1.4.4.1.g278f

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