[ 3.5.y.z extended stable ] Patch "USB: ark3116: fix use-after-free in TIOCMIWAIT" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    USB: ark3116: fix use-after-free in TIOCMIWAIT

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From b12d6be5cf0d481a7d37656abd1d5d1b1b3594ab Mon Sep 17 00:00:00 2001
From: Johan Hovold <jhovold at gmail.com>
Date: Tue, 19 Mar 2013 09:21:11 +0100
Subject: [PATCH] USB: ark3116: fix use-after-free in TIOCMIWAIT

commit 5018860321dc7a9e50a75d5f319bc981298fb5b7 upstream.

Use the port wait queue and make sure to check the serial disconnected
flag before accessing private port data after waking up.

This is is needed as the private port data (including the wait queue
itself) can be gone when waking up after a disconnect.

Signed-off-by: Johan Hovold <jhovold at gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/usb/serial/ark3116.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/usb/serial/ark3116.c b/drivers/usb/serial/ark3116.c
index f8ce97d..15bd068 100644
--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -68,7 +68,6 @@ static int is_irda(struct usb_serial *serial)
 }

 struct ark3116_private {
-	wait_queue_head_t       delta_msr_wait;
 	struct async_icount	icount;
 	int			irda;	/* 1 for irda device */

@@ -148,7 +147,6 @@ static int ark3116_attach(struct usb_serial *serial)
 	if (!priv)
 		return -ENOMEM;

-	init_waitqueue_head(&priv->delta_msr_wait);
 	mutex_init(&priv->hw_lock);
 	spin_lock_init(&priv->status_lock);

@@ -461,10 +459,14 @@ static int ark3116_ioctl(struct tty_struct *tty,
 	case TIOCMIWAIT:
 		for (;;) {
 			struct async_icount prev = priv->icount;
-			interruptible_sleep_on(&priv->delta_msr_wait);
+			interruptible_sleep_on(&port->delta_msr_wait);
 			/* see if a signal did it */
 			if (signal_pending(current))
 				return -ERESTARTSYS;
+
+			if (port->serial->disconnected)
+				return -EIO;
+
 			if ((prev.rng == priv->icount.rng) &&
 			    (prev.dsr == priv->icount.dsr) &&
 			    (prev.dcd == priv->icount.dcd) &&
@@ -585,7 +587,7 @@ static void ark3116_update_msr(struct usb_serial_port *port, __u8 msr)
 			priv->icount.dcd++;
 		if (msr & UART_MSR_TERI)
 			priv->icount.rng++;
-		wake_up_interruptible(&priv->delta_msr_wait);
+		wake_up_interruptible(&port->delta_msr_wait);
 	}
 }

--
1.8.1.2