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USB: gadget: validate endpoint index for xilinx udc

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commit 7f14c7227f342d9932f9b918893c8814f86d2a0d upstream.

Assure that host may not manipulate the index to point
past endpoint array.

Signed-off-by: Szymon Heidrich <szymon.heidrich@gmail.com>
Cc: stable <stable@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Szymon Heidrich 2022-02-21 13:24:56 +01:00 committed by Greg Kroah-Hartman
parent 9ab652d41d
commit 6b23eda989
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/gadget/udc/udc-xilinx.c
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@ -1613,6 +1613,8 @@ static void xudc_getstatus(struct xusb_udc *udc)
break;
case USB_RECIP_ENDPOINT:
epnum = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK;
if (epnum >= XUSB_MAX_ENDPOINTS)
goto stall;
target_ep = &udc->ep[epnum];
epcfgreg = udc->read_fn(udc->addr + target_ep->offset);
halt = epcfgreg & XUSB_EP_CFG_STALL_MASK;
@ -1680,6 +1682,10 @@ static void xudc_set_clear_feature(struct xusb_udc *udc)
case USB_RECIP_ENDPOINT:
if (!udc->setup.wValue) {
endpoint = udc->setup.wIndex & USB_ENDPOINT_NUMBER_MASK;
if (endpoint >= XUSB_MAX_ENDPOINTS) {
xudc_ep0_stall(udc);
return;
}
target_ep = &udc->ep[endpoint];
outinbit = udc->setup.wIndex & USB_ENDPOINT_DIR_MASK;
outinbit = outinbit >> 7;