linux-kernel - [PATCH] usb: gadget: aspeed_udc: validate endpoint index for ast udc

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Message-Id: <20240622095618.1890093-1-make24@iscas.ac.cn>
Date: Sat, 22 Jun 2024 17:56:18 +0800
From: Ma Ke <make24@...as.ac.cn>
To: neal_liu@...eedtech.com,
	gregkh@...uxfoundation.org,
	joel@....id.au,
	andrew@...econstruct.com.au
Cc: linux-aspeed@...ts.ozlabs.org,
	linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Ma Ke <make24@...as.ac.cn>
Subject: [PATCH] usb: gadget: aspeed_udc: validate endpoint index for ast 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 <make24@...as.ac.cn>
---
 drivers/usb/gadget/udc/aspeed_udc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/gadget/udc/aspeed_udc.c b/drivers/usb/gadget/udc/aspeed_udc.c
index 3916c8e2ba01..95060592c231 100644
--- a/drivers/usb/gadget/udc/aspeed_udc.c
+++ b/drivers/usb/gadget/udc/aspeed_udc.c
@@ -1009,6 +1009,8 @@ static void ast_udc_getstatus(struct ast_udc_dev *udc)
 		break;
 	case USB_RECIP_ENDPOINT:
 		epnum = crq.wIndex & USB_ENDPOINT_NUMBER_MASK;
+		if (epnum >= USB_MAX_ENDPOINTS)
+			goto stall;
 		status = udc->ep[epnum].stopped;
 		break;
 	default:
-- 
2.25.1