linux-kernel - Re: [PATCH v3] net: usb: rtl8150: set random MAC address when set_ethernet

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Date:   Sat, 03 Oct 2020 14:35:23 -0700
From:   Joe Perches <joe@...ches.com>
To:     Anant Thazhemadam <anant.thazhemadam@...il.com>
Cc:     linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+abbc768b560c84d92fd3@...kaller.appspotmail.com,
        Petko Manolov <petkan@...leusys.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>, linux-usb@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] net: usb: rtl8150: set random MAC address when
 set_ethernet_addr() fails

On Sun, 2020-10-04 at 02:49 +0530, Anant Thazhemadam wrote:
> When get_registers() fails, in set_ethernet_addr(),the uninitialized
> value of node_id gets copied as the address. This can be considered as
> set_ethernet_addr() itself failing.
[]
> diff --git a/drivers/net/usb/rtl8150.c b/drivers/net/usb/rtl8150.c
[]
> @@ -909,7 +914,10 @@ static int rtl8150_probe(struct usb_interface *intf,
>  		goto out1;
>  	}
>  	fill_skb_pool(dev);
> -	set_ethernet_addr(dev);
> +	if (!set_ethernet_addr(dev)) {
> +		dev_err(&intf->dev, "assigining a random MAC address\n");
> +		eth_hw_addr_random(dev->netdev);

4 things:

o Typo for assigning
o Reverse the assignment and message to show the new random MAC
o This should use netdev_<level>
o Is this better as error or notification?

	if (!set_ethernet_addr(dev)) {
		eth_hw_addr_random(dev->netdev);
		netdev_notice(dev->netdev, "Assigned a random MAC: %pM\n",
			      dev->netdev->dev_addr);
	}