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Date:   Wed, 15 Jul 2020 09:59:31 -0400
From:   George Kennedy <george.kennedy@...cle.com>
To:     george.kennedy@...cle.com, davem@...emloft.net,
        netdev@...r.kernel.org, dan.carpenter@...cle.com, kuba@...nel.org,
        dhaval.giani@...cle.com
Subject: [PATCH v2 1/1] ax88172a: fix ax88172a_unbind() failures

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

Signed-off-by: George Kennedy <george.kennedy@...cle.com>
Reported-by: syzbot+4cd84f527bf4a10fc9c1@...kaller.appspotmail.com
---
 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 4e514f5..fd3a04d 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);
-- 
1.8.3.1

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