linux-kernel - [PATCH v3] usb: gadget: aspeed_udc: validate endpoint index for ast udc

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Date: Tue, 25 Jun 2024 10:03:26 +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 <make_ruc2021@....com>
Subject: [PATCH v3] usb: gadget: aspeed_udc: validate endpoint index for ast udc

From: Ma Ke <make_ruc2021@....com>

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 <make_ruc2021@....com>
---
Changes in v3:
- added the changelog as suggested.
Changes in v2:
- use correct macro-defined constants as suggested;
- explain the method for finding and testing vulnearabilities.
---
 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