From: Peter Hurley <peter@hurleysoftware.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org,
Jiri Slaby <jslaby@suse.cz>,
One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
Peter Hurley <peter@hurleysoftware.com>
Subject: [PATCH -next 06/10] tty: Remove !tty condition from __proc_set_tty()
Date: Thu, 16 Oct 2014 14:59:46 -0400 [thread overview]
Message-ID: <1413485990-16855-7-git-send-email-peter@hurleysoftware.com> (raw)
In-Reply-To: <1413485990-16855-1-git-send-email-peter@hurleysoftware.com>
The tty parameter to __proc_set_tty() cannot be NULL; all
call sites have already dereferenced tty.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
drivers/tty/tty_io.c | 25 ++++++++++++-------------
1 file changed, 12 insertions(+), 13 deletions(-)
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c224488..e33edfa 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -506,19 +506,18 @@ void proc_clear_tty(struct task_struct *p)
static void __proc_set_tty(struct tty_struct *tty)
{
- if (tty) {
- unsigned long flags;
- /* We should not have a session or pgrp to put here but.... */
- spin_lock_irqsave(&tty->ctrl_lock, flags);
- put_pid(tty->session);
- put_pid(tty->pgrp);
- tty->pgrp = get_pid(task_pgrp(current));
- spin_unlock_irqrestore(&tty->ctrl_lock, flags);
- tty->session = get_pid(task_session(current));
- if (current->signal->tty) {
- printk(KERN_DEBUG "tty not NULL!!\n");
- tty_kref_put(current->signal->tty);
- }
+ unsigned long flags;
+
+ /* We should not have a session or pgrp to put here but.... */
+ spin_lock_irqsave(&tty->ctrl_lock, flags);
+ put_pid(tty->session);
+ put_pid(tty->pgrp);
+ tty->pgrp = get_pid(task_pgrp(current));
+ spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+ tty->session = get_pid(task_session(current));
+ if (current->signal->tty) {
+ printk(KERN_DEBUG "tty not NULL!!\n");
+ tty_kref_put(current->signal->tty);
}
put_pid(current->signal->tty_old_pgrp);
current->signal->tty = tty_kref_get(tty);
--
2.1.1
next prev parent reply other threads:[~2014-10-16 18:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 18:59 [PATCH -next 00/10] Fixes to controlling tty handling Peter Hurley
2014-10-16 18:59 ` [PATCH -next 01/10] tty: Remove tty_pair_get_tty()/tty_pair_get_pty() api Peter Hurley
2014-10-16 18:59 ` [PATCH -next 02/10] tty: Reorder proc_set_tty() and related fns Peter Hurley
2014-10-16 18:59 ` [PATCH -next 03/10] tty: Remove tsk parameter from proc_set_tty() Peter Hurley
2014-10-16 18:59 ` [PATCH -next 04/10] uml: Fix unsafe pid reference to foreground process group Peter Hurley
2014-10-17 7:57 ` Richard Weinberger
2014-10-16 18:59 ` [PATCH -next 05/10] tty: Replace open-coded tty_get_pgrp() Peter Hurley
2014-10-16 18:59 ` Peter Hurley [this message]
2014-10-16 18:59 ` [PATCH -next 07/10] tty: Fix multiple races when setting the controlling terminal Peter Hurley
2014-10-16 18:59 ` [PATCH -next 08/10] tty: Move session_of_pgrp() and make static Peter Hurley
2014-10-16 18:59 ` [PATCH -next 09/10] tty: Serialize proc_set_tty() with tty_lock Peter Hurley
2014-10-16 18:59 ` [PATCH -next 10/10] tty: Update code comment in __proc_set_tty() Peter Hurley
2014-10-22 15:00 ` [PATCH -next 00/10] Fixes to controlling tty handling One Thousand Gnomes
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