From: Fei Yang <fei.yang@intel.com>
Date: Wed, 20 Apr 2016 06:08:43 +0000 (+0300)
Subject: UPSTREAM: usb: dwc3: ep0: sanity check test mode selector
X-Git-Tag: firefly_0821_release~1849
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=fd219f74f1fe1cddf84aac1e902f61e7df2b6de5;p=firefly-linux-kernel-4.4.55.git

UPSTREAM: usb: dwc3: ep0: sanity check test mode selector

In case host sends us an unsupported test mode, we
*must* stall this request. This will tell the host
that the selector is invalid and we won't put the
controller in unsupported test modes which could
have undetermined side-effects.

Change-Id: Iaf6a0ae78864efa342a514fdd5e6fc7f2e94e314
Signed-off-by: Fei Yang <fei.yang@intel.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Signed-off-by: Wu Liang feng <wulf@rock-chips.com>
(cherry picked from commit ae411413760785a0a2ce6cb44d5afe95115aa24d)
---

diff --git a/drivers/usb/dwc3/ep0.c b/drivers/usb/dwc3/ep0.c
index 12b0ec2b2712..e153e0262f81 100644
--- a/drivers/usb/dwc3/ep0.c
+++ b/drivers/usb/dwc3/ep0.c
@@ -460,8 +460,18 @@ static int dwc3_ep0_handle_feature(struct dwc3 *dwc,
 			if (!set)
 				return -EINVAL;
 
-			dwc->test_mode_nr = wIndex >> 8;
-			dwc->test_mode = true;
+			switch (wIndex >> 8) {
+			case TEST_J:
+			case TEST_K:
+			case TEST_SE0_NAK:
+			case TEST_PACKET:
+			case TEST_FORCE_EN:
+				dwc->test_mode_nr = wIndex >> 8;
+				dwc->test_mode = true;
+				break;
+			default:
+				return -EINVAL;
+			}
 			break;
 		default:
 			return -EINVAL;