usb gadget: composite: prevent OOPS for non-standard control request
authorRoger Quadros <roger.quadros@nokia.com>
Wed, 8 Sep 2010 10:48:44 +0000 (13:48 +0300)
committerGreg Kroah-Hartman <gregkh@suse.de>
Fri, 22 Oct 2010 17:21:37 +0000 (10:21 -0700)
The composite gadget will OOPS if the host sends a control request
targetted to an interface of an un-configured composite device. This patch
prevents this.

The OOPS was observed during WHQL USB CV tests. With this patch, the device
STALLs as per requirement.

Failing test case: From host do the following. I used libusb-1.0

1) Set configuration to zero.
libusb_control_transfer(device_handle,
0, /* standard OUT */
0x9, /* setConfiguration */
0, 0, NULL, 0, 0);

2) Query current configuratioan.
libusb_control_transfer(device_handle,
0x80, /* standard IN*/
0x8, /* getConfiguration */
0, 0, data, 1, 0);

3) Send the non-standard ctrl transfer targetted to interface
libusb_control_transfer(device_handle,
0x81, /* standard IN to interface*/
0x6, /* getDescriptor */
0x2300, 0, data, 0x12, 0);

Signed-off-by: Roger Quadros <roger.quadros@nokia.com>
Cc: stable <stable@kernel.org>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Michal Nazarewicz <m.nazarewicz@samsung.com>
Cc: Robert Lukassen <robert.lukassen@tomtom.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
drivers/usb/gadget/composite.c

index 5e2bd74..7b5cc16 100644 (file)
@@ -928,7 +928,8 @@ unknown:
                 */
                switch (ctrl->bRequestType & USB_RECIP_MASK) {
                case USB_RECIP_INTERFACE:
-                       f = cdev->config->interface[intf];
+                       if (cdev->config)
+                               f = cdev->config->interface[intf];
                        break;
 
                case USB_RECIP_ENDPOINT: