usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc

[ Upstream commit ce9daa2efc0872a9a68ea51dc8000df05893ef2e ]

We should verify the bound of the array to assure that host
may not manipulate the index to point past endpoint array.

Signed-off-by: Ma Ke <make_ruc2021@163.com>
Acked-by: Li Yang <leoyang.li@nxp.com>
Link: https://lore.kernel.org/r/20230628081511.186850-1-make_ruc2021@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/usb/gadget/udc/fsl_qe_udc.c b/drivers/usb/gadget/udc/fsl_qe_udc.c
index a3e72d690eef9532cb7d5d9338247355ff69d07a..c14d5870d99f4acdd83f40fa44fc1679d5edce96 100644 (file)
--- a/drivers/usb/gadget/udc/fsl_qe_udc.c
+++ b/drivers/usb/gadget/udc/fsl_qe_udc.c
@@ -1954,9 +1954,13 @@ static void ch9getstatus(struct qe_udc *udc, u8 request_type, u16 value,
        } else if ((request_type & USB_RECIP_MASK) == USB_RECIP_ENDPOINT) {
                /* Get endpoint status */
                int pipe = index & USB_ENDPOINT_NUMBER_MASK;
-               struct qe_ep *target_ep = &udc->eps[pipe];
+               struct qe_ep *target_ep;
                u16 usep;
 
+               if (pipe >= USB_MAX_ENDPOINTS)
+                       goto stall;
+               target_ep = &udc->eps[pipe];
+
                /* stall if endpoint doesn't exist */
                if (!target_ep->ep.desc)
                        goto stall;