linux-kernel - [PATCH 65/68] TTY: pdc_cons, fix open vs pdc_console_tty

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Message-Id: <1330955575-26641-66-git-send-email-jslaby@suse.cz>
Date:	Mon,  5 Mar 2012 14:52:52 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	gregkh@...uxfoundation.org
Cc:	alan@...ux.intel.com, linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org, jirislaby@...il.com,
	Kyle McMartin <kyle@...artin.ca>, Helge Deller <deller@....de>,
	"James E.J. Bottomley" <jejb@...isc-linux.org>
Subject: [PATCH 65/68] TTY: pdc_cons, fix open vs pdc_console_tty_driver race

Assign the pointer to pdc_console_tty_driver (a tty_driver) earlier.
Otherwise the timer may dereference NULL.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Kyle McMartin <kyle@...artin.ca>
Cc: Helge Deller <deller@....de>
Cc: "James E.J. Bottomley" <jejb@...isc-linux.org>
---
 arch/parisc/kernel/pdc_cons.c |   29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/arch/parisc/kernel/pdc_cons.c b/arch/parisc/kernel/pdc_cons.c
index 8ad0521..d14e20f 100644
--- a/arch/parisc/kernel/pdc_cons.c
+++ b/arch/parisc/kernel/pdc_cons.c
@@ -160,9 +160,7 @@ static void pdc_console_poll(unsigned long unused)
 
 static int __init pdc_console_tty_driver_init(void)
 {
-
 	int err;
-	struct tty_driver *drv;
 
 	/* Check if the console driver is still registered.
 	 * It is unregistered if the pdc console was not selected as the
@@ -184,28 +182,27 @@ static int __init pdc_console_tty_driver_init(void)
 	printk(KERN_INFO "The PDC console driver is still registered, removing CON_BOOT flag\n");
 	pdc_cons.flags &= ~CON_BOOT;
 
-	drv = alloc_tty_driver(1);
+	pdc_console_tty_driver = alloc_tty_driver(1);
 
-	if (!drv)
+	if (!pdc_console_tty_driver)
 		return -ENOMEM;
 
-	drv->driver_name = "pdc_cons";
-	drv->name = "ttyB";
-	drv->major = MUX_MAJOR;
-	drv->minor_start = 0;
-	drv->type = TTY_DRIVER_TYPE_SYSTEM;
-	drv->init_termios = tty_std_termios;
-	drv->flags = TTY_DRIVER_REAL_RAW | TTY_DRIVER_RESET_TERMIOS;
-	tty_set_operations(drv, &pdc_console_tty_ops);
-
-	err = tty_register_driver(drv);
+	pdc_console_tty_driver->driver_name = "pdc_cons";
+	pdc_console_tty_driver->name = "ttyB";
+	pdc_console_tty_driver->major = MUX_MAJOR;
+	pdc_console_tty_driver->minor_start = 0;
+	pdc_console_tty_driver->type = TTY_DRIVER_TYPE_SYSTEM;
+	pdc_console_tty_driver->init_termios = tty_std_termios;
+	pdc_console_tty_driver->flags = TTY_DRIVER_REAL_RAW |
+		TTY_DRIVER_RESET_TERMIOS;
+	tty_set_operations(pdc_console_tty_driver, &pdc_console_tty_ops);
+
+	err = tty_register_driver(pdc_console_tty_driver);
 	if (err) {
 		printk(KERN_ERR "Unable to register the PDC console TTY driver\n");
 		return err;
 	}
 
-	pdc_console_tty_driver = drv;
-
 	return 0;
 }
 
-- 
1.7.9.2


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