[PATCH] usb gadget: composite: prevent OOPS for non-standard control request

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From: Roger Quadros <roger.quadros@xxxxxxxxx>

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@xxxxxxxxx>
---
 drivers/usb/gadget/composite.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 63b187d..23bd9da 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -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:
-- 
1.6.0.4

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