Subject: [PATCH 36/38] ax88172a: fix ax88172a_unbind() failures

From: George Kennedy <[email-masked]>
Date: Wed, 15 Jul 2020 09:59:31 -0400

[ Upstream commit c28d9a285668c799eeae2f7f93e929a6028a4d6d ]

If ax88172a_unbind() fails, make sure that the return code is
less than zero so that cleanup is done properly and avoid UAF.

Fixes: a9a51bd727d1 ("ax88172a: fix information leak on short answers")
Signed-off-by: George Kennedy <[email-masked]>
Reported-by: [email-masked]
Signed-off-by: Jakub Kicinski <[email-masked]>
---
 drivers/net/usb/ax88172a.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/usb/ax88172a.c b/drivers/net/usb/ax88172a.c
index 4e514f5d7c6c..fd3a04d98dc1 100644
--- a/drivers/net/usb/ax88172a.c
+++ b/drivers/net/usb/ax88172a.c
@@ -187,6 +187,7 @@ static int ax88172a_bind(struct usbnet *dev, struct usb_interface *intf)
 	ret = asix_read_cmd(dev, AX_CMD_READ_NODE_ID, 0, 0, ETH_ALEN, buf, 0);
 	if (ret < ETH_ALEN) {
 		netdev_err(dev->net, "Failed to read MAC address: %d\n", ret);
+		ret = -EIO;
 		goto free;
 	}
 	memcpy(dev->net->dev_addr, buf, ETH_ALEN);
-- 
2.26.2