linux-kernel - [PATCH AUTOSEL 6.6 12/17] usb: gadget: aspeed_udc: validate endpoint index for ast udc

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Message-ID: <20240728160709.2052627-12-sashal@kernel.org>
Date: Sun, 28 Jul 2024 12:06:48 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Ma Ke <make24@...as.ac.cn>,
	Andrew Jeffery <andrew@...econstruct.com.au>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sasha Levin <sashal@...nel.org>,
	neal_liu@...eedtech.com,
	joel@....id.au,
	linux-aspeed@...ts.ozlabs.org,
	linux-usb@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 6.6 12/17] usb: gadget: aspeed_udc: validate endpoint index for ast udc

From: Ma Ke <make24@...as.ac.cn>

[ Upstream commit ee0d382feb44ec0f445e2ad63786cd7f3f6a8199 ]

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>
Reviewed-by: Andrew Jeffery <andrew@...econstruct.com.au>
Acked-by: Andrew Jeffery <andrew@...econstruct.com.au>
Link: https://lore.kernel.org/r/20240625022306.2568122-1-make24@iscas.ac.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 fc2ead0fe6217..4868286574a1c 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:
-- 
2.43.0