linux-kernel - [PATCH v2] usb: gadget: aspeed_udc: validate endpoint index for ast udc

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Message-Id: <20240624015314.2249128-1-make24@iscas.ac.cn>
Date: Mon, 24 Jun 2024 09:53:13 +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 v2] 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.

Found by static analysis.

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..d972ef4644bc 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 >= AST_UDC_NUM_ENDPOINTS)
+			goto stall;
 		status = udc->ep[epnum].stopped;
 		break;
 	default:
-- 
2.25.1