Subject: [PATCH AUTOSEL 6.5 14/28] usb: gadget: fsl_qe_udc: validate endpoint index for ch9 udc

From: Sasha Levin <[email-masked]>
Date: Fri, 8 Sep 2023 20:35:48 -0400

From: Ma Ke <[email-masked]>

[ 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 <[email-masked]>
Acked-by: Li Yang <[email-masked]>
Link: https://lore.kernel.org/r/[email-masked]
Signed-off-by: Greg Kroah-Hartman <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 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 9c5dc1c1a68ea..4aae86b47edfc 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;
 
-- 
2.40.1