From: Roger Quadros <roger.quadros@nokia.com>
Date: Wed, 8 Sep 2010 10:48:44 +0000 (+0300)
Subject: usb gadget: composite: prevent OOPS for non-standard control request
X-Git-Tag: firefly_0821_release~9833^2~79^2^2~323
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f126de5151892e68f8d46430515cb6524315fe93;p=firefly-linux-kernel-4.4.55.git

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

commit 5c836e4d583701a5eecb288b5f131da39115f5ec upstream.

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: 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>
---

diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 1160c55de7f2..9a98c38ced8f 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -901,7 +901,8 @@ 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: