USB: Stall control endpoint when file storage class request wValue != 0

This patch makes the File Storage Gadget stall the control endpoint
when a MSC class request is made with wValue != 0.  This change makes
some MSC compliance test warnings disappear.

Signed-off-by: Luis Lloret <luislloret@gmail.com>
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index be7a1bd2823b..01ddb6d3e51b 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1295,6 +1295,7 @@ static int class_setup_req(struct fsg_dev *fsg,
         struct usb_request      *req = fsg->ep0req;
         int                     value = -EOPNOTSUPP;
         u16                     w_index = le16_to_cpu(ctrl->wIndex);
+        u16                     w_value = le16_to_cpu(ctrl->wValue);
         u16                     w_length = le16_to_cpu(ctrl->wLength);
 
         if (!fsg->config)
@@ -1308,7 +1309,7 @@ static int class_setup_req(struct fsg_dev *fsg,
                         if (ctrl->bRequestType != (USB_DIR_OUT |
                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE))
                                 break;
-                        if (w_index != 0) {
+                        if (w_index != 0 || w_value != 0) {
                                 value = -EDOM;
                                 break;
                         }
@@ -1324,7 +1325,7 @@ static int class_setup_req(struct fsg_dev *fsg,
                         if (ctrl->bRequestType != (USB_DIR_IN |
                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE))
                                 break;
-                        if (w_index != 0) {
+                        if (w_index != 0 || w_value != 0) {
                                 value = -EDOM;
                                 break;
                         }
@@ -1343,7 +1344,7 @@ static int class_setup_req(struct fsg_dev *fsg,
                         if (ctrl->bRequestType != (USB_DIR_OUT |
                                         USB_TYPE_CLASS | USB_RECIP_INTERFACE))
                                 break;
-                        if (w_index != 0) {
+                        if (w_index != 0 || w_value != 0) {
                                 value = -EDOM;
                                 break;
                         }