[ 068/171 ] USB: serial: fix interface refcounting

[Steven Rostedt]

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

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

From: Johan Hovold <jhovold@xxxxxxxxx>

[ Upstream commit d7971051e4df825e0bc11b995e87bfe86355b8e5 ]

Make sure the interface is not released before our serial device.

Note that drivers are still not allowed to access the interface in
any way that may interfere with another driver that may have gotten
bound to the same interface after disconnect returns.

Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <jhovold@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 drivers/usb/serial/usb-serial.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c
index 667c39c..da1e728 100644
--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -157,6 +157,7 @@ static void destroy_serial(struct kref *kref)
 		}
 	}
 
+	usb_put_intf(serial->interface);
 	usb_put_dev(serial->dev);
 	kfree(serial);
 }
@@ -614,7 +615,7 @@ static struct usb_serial *create_serial(struct usb_device *dev,
 	}
 	serial->dev = usb_get_dev(dev);
 	serial->type = driver;
-	serial->interface = interface;
+	serial->interface = usb_get_intf(interface);
 	kref_init(&serial->kref);
 	mutex_init(&serial->disc_mutex);
 	serial->minor = SERIAL_TTY_NO_MINOR;
-- 
1.7.10.4


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