linux-kernel - [PATCH] media: dvb-usb: dw2102: Fix uninit-value in su3000_read_mac

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Message-Id: <20230328124416.560889-1-harperchen1110@gmail.com>
Date:   Tue, 28 Mar 2023 12:44:16 +0000
From:   Wei Chen <harperchen1110@...il.com>
To:     mchehab@...nel.org
Cc:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        Wei Chen <harperchen1110@...il.com>
Subject: [PATCH] media: dvb-usb: dw2102: Fix uninit-value in su3000_read_mac_address

In su3000_read_mac_address, if i2c_transfer fails to execute two
messages, array mac address will not be initialized. Without handling
such error, later in function dvb_usb_adapter_dvb_init, proposed_mac
is accessed before initialization.

Fix this error by returning a negative value if message execution fails.

Signed-off-by: Wei Chen <harperchen1110@...il.com>
---
 drivers/media/usb/dvb-usb/dw2102.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c
index 0ca764282c76..8747960e6146 100644
--- a/drivers/media/usb/dvb-usb/dw2102.c
+++ b/drivers/media/usb/dvb-usb/dw2102.c
@@ -946,7 +946,7 @@ static int su3000_read_mac_address(struct dvb_usb_device *d, u8 mac[6])
 	for (i = 0; i < 6; i++) {
 		obuf[1] = 0xf0 + i;
 		if (i2c_transfer(&d->i2c_adap, msg, 2) != 2)
-			break;
+			return -1;
 		else
 			mac[i] = ibuf[0];
 	}
-- 
2.25.1