linux-kernel - Re: Possible "struct pid" leak from tty

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Date:	Wed, 14 Mar 2007 08:40:43 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Catalin Marinas" <catalin.marinas@...il.com>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>
Subject: Re: Possible "struct pid" leak from tty_io.c

How does this look?

I don't have the setup to test this easily, but this bit makes seems to make
sense.  I will keep code reviewing and see if I can convince myself that this
is correct or incorrect in the mean time...

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index e453268..fc125ac 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1376,6 +1376,8 @@ static void do_tty_hangup(struct work_struct *work)
 	read_unlock(&tasklist_lock);

 	tty->flags = 0;
+	put_pid(tty->session);
+	put_pid(tty->pgrp);
 	tty->session = NULL;
 	tty->pgrp = NULL;
 	tty->ctrl_status = 0;
@@ -3841,6 +3843,8 @@ static struct pid *__proc_set_tty(struct task_struct *tsk, struct tty_struct *tt
 {
 	struct pid *old_pgrp;
 	if (tty) {
+		put_pid(tty->session);
+		put_pid(tty->pgrp);
 		tty->session = get_pid(task_session(tsk));
 		tty->pgrp = get_pid(task_pgrp(tsk));
 	}
-
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