linux-kernel - [PATCH v4] usb: gadget: aspeed_udc: validate endpoint index for ast udc

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Date: Tue, 25 Jun 2024 10:23:06 +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 v4] 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>
---
Changes in v4:
- used a consistent email address to send patches, sorry for my negligence.
Changes in v3:
- added the changelog as suggested.
Changes in v2:
- used the correct macro-defined constants as suggested;
- explained the method for finding and testing vulnerabilities.
---
 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