USB: usbip: fix nonconforming hub descriptor

Fix up the root-hub descriptor to accommodate the variable-length
DeviceRemovable and PortPwrCtrlMask fields, while marking all ports as
removable (and leaving the reserved bit zero unset).

Also add a build-time constraint on VHCI_HC_PORTS which must never be
greater than USB_MAXCHILDREN (but this was only enforced through a
KConfig constant).

This specifically fixes the descriptor layout whenever VHCI_HC_PORTS is
greater than seven (default is 8).

Fixes: 04679b3489e0 ("Staging: USB/IP: add client driver")
Cc: Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Cc: Valentina Manea <valentina.manea.m@gmail.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 3 deletions

diff --git a/drivers/usb/usbip/vhci_hcd.c b/drivers/usb/usbip/vhci_hcd.c
index 5d8b2c261940..0585078638db 100644
--- a/drivers/usb/usbip/vhci_hcd.c
+++ b/drivers/usb/usbip/vhci_hcd.c
@@ -235,14 +235,19 @@ done:
 
 static inline void hub_descriptor(struct usb_hub_descriptor *desc)
 {
+        int width;
+
         memset(desc, 0, sizeof(*desc));
         desc->bDescriptorType = USB_DT_HUB;
-        desc->bDescLength = 9;
         desc->wHubCharacteristics = cpu_to_le16(
                 HUB_CHAR_INDV_PORT_LPSM | HUB_CHAR_COMMON_OCPM);
+
         desc->bNbrPorts = VHCI_HC_PORTS;
-        desc->u.hs.DeviceRemovable[0] = 0xff;
-        desc->u.hs.DeviceRemovable[1] = 0xff;
+        BUILD_BUG_ON(VHCI_HC_PORTS > USB_MAXCHILDREN);
+        width = desc->bNbrPorts / 8 + 1;
+        desc->bDescLength = USB_DT_HUB_NONVAR_SIZE + 2 * width;
+        memset(&desc->u.hs.DeviceRemovable[0], 0, width);
+        memset(&desc->u.hs.DeviceRemovable[width], 0xff, width);
 }
 
 static int vhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,