[PATCH] usb: gadget: dummy_hcd: Reject hub port requests for non-existent ports

[pip-izony]

From: Seungjin Bae <eeodqql09@xxxxxxxxx>

The `dummy_hub_control()` function handles USB hub class requests
to the virtual root hub. The `GetPortStatus` case returns -EPIPE for
requests with `wIndex != 1`, since the virtual root hub has only a
single port. However, the `ClearPortFeature` and `SetPortFeature`
cases lack the same check.

Fix this by extending the `wIndex != 1` rejection to both cases,
matching the existing behavior of `GetPortStatus`.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Seungjin Bae <eeodqql09@xxxxxxxxx>
---
 drivers/usb/gadget/udc/dummy_hcd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index f094491b1041..f47903461ed5 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -2134,6 +2134,8 @@ static int dummy_hub_control(
 	case ClearHubFeature:
 		break;
 	case ClearPortFeature:
+		if (wIndex != 1)
+			goto error;
 		switch (wValue) {
 		case USB_PORT_FEAT_SUSPEND:
 			if (hcd->speed == HCD_USB3) {
@@ -2248,6 +2250,8 @@ static int dummy_hub_control(
 		retval = -EPIPE;
 		break;
 	case SetPortFeature:
+		if (wIndex != 1)
+			goto error;
 		switch (wValue) {
 		case USB_PORT_FEAT_LINK_STATE:
 			if (hcd->speed != HCD_USB3) {
-- 
2.43.0