linux-kernel - [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc

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Date:   Wed, 28 Jun 2023 16:15:11 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     leoyang.li@....com
Cc:     gregkh@...uxfoundation.org, linux-usb@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH] usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc

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@....com>
---
 drivers/usb/gadget/udc/fsl_qe_udc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/fsl_qe_udc.c b/drivers/usb/gadget/udc/fsl_qe_udc.c
index 3b1cc8fa30c8..f4e5cbd193b7 100644
--- a/drivers/usb/gadget/udc/fsl_qe_udc.c
+++ b/drivers/usb/gadget/udc/fsl_qe_udc.c
@@ -1959,6 +1959,8 @@ 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;
+		if (pipe >= USB_MAX_ENDPOINTS)
+			goto stall;
 		struct qe_ep *target_ep = &udc->eps[pipe];
 		u16 usep;
 
-- 
2.37.2