linux-kernel - [ 29/85] USB: ark3116: fix NULL-pointer dereference

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Date:	Thu, 25 Oct 2012 17:05:47 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk, Johan Hovold <jhovold@...il.com>
Subject: [ 29/85] USB: ark3116: fix NULL-pointer dereference

3.6-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@...il.com>

commit 7bdce71822f471433dd3014692e9096996c7b5f0 upstream.

Fix NULL-pointer dereference at release by replacing attach and release
with port_probe and port_remove.

Since commit 0998d0631001288 (device-core: Ensure drvdata = NULL when no
driver is bound) the port private data is NULL when release is called.

Compile-only tested.

Signed-off-by: Johan Hovold <jhovold@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/serial/ark3116.c |   26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

--- a/drivers/usb/serial/ark3116.c
+++ b/drivers/usb/serial/ark3116.c
@@ -126,9 +126,6 @@ static inline int calc_divisor(int bps)
 
 static int ark3116_attach(struct usb_serial *serial)
 {
-	struct usb_serial_port *port = serial->port[0];
-	struct ark3116_private *priv;
-
 	/* make sure we have our end-points */
 	if ((serial->num_bulk_in == 0) ||
 	    (serial->num_bulk_out == 0) ||
@@ -143,8 +140,15 @@ static int ark3116_attach(struct usb_ser
 		return -EINVAL;
 	}
 
-	priv = kzalloc(sizeof(struct ark3116_private),
-		       GFP_KERNEL);
+	return 0;
+}
+
+static int ark3116_port_probe(struct usb_serial_port *port)
+{
+	struct usb_serial *serial = port->serial;
+	struct ark3116_private *priv;
+
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return -ENOMEM;
 
@@ -199,18 +203,15 @@ static int ark3116_attach(struct usb_ser
 	return 0;
 }
 
-static void ark3116_release(struct usb_serial *serial)
+static int ark3116_port_remove(struct usb_serial_port *port)
 {
-	struct usb_serial_port *port = serial->port[0];
 	struct ark3116_private *priv = usb_get_serial_port_data(port);
 
 	/* device is closed, so URBs and DMA should be down */
-
-	usb_set_serial_port_data(port, NULL);
-
 	mutex_destroy(&priv->hw_lock);
-
 	kfree(priv);
+
+	return 0;
 }
 
 static void ark3116_init_termios(struct tty_struct *tty)
@@ -725,7 +726,8 @@ static struct usb_serial_driver ark3116_
 	.id_table =		id_table,
 	.num_ports =		1,
 	.attach =		ark3116_attach,
-	.release =		ark3116_release,
+	.port_probe =		ark3116_port_probe,
+	.port_remove =		ark3116_port_remove,
 	.set_termios =		ark3116_set_termios,
 	.init_termios =		ark3116_init_termios,
 	.ioctl =		ark3116_ioctl,


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