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| author | Roger Quadros <roger.quadros@nokia.com> | 2010-09-08 13:48:44 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-22 10:21:37 -0700 |
| commit | 5c836e4d583701a5eecb288b5f131da39115f5ec (patch) | |
| tree | 322bb97d9988b86bb29748a210798fc166f14f35 /drivers/usb/gadget/composite.c | |
| parent | 3df7169e73fc1d71a39cffeacc969f6840cdf52b (diff) | |
| download | linux-5c836e4d583701a5eecb288b5f131da39115f5ec.tar.gz | |
usb gadget: composite: prevent OOPS for non-standard control request
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>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
| -rw-r--r-- | 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 5e2bd7428424..7b5cc16e4a0b 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: |