netdev - Re: [PATCH net v3] ibmvnic: fix ibmvnic_set

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Message-ID: <20201029113426.09ff67ec@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Thu, 29 Oct 2020 11:34:26 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Lijun Pan <ljp@...ux.ibm.com>
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net v3] ibmvnic: fix ibmvnic_set_mac

On Tue, 27 Oct 2020 17:04:56 -0500 Lijun Pan wrote:
> Jakub Kicinski brought up a concern in ibmvnic_set_mac().
> ibmvnic_set_mac() does this:
> 
> 	ether_addr_copy(adapter->mac_addr, addr->sa_data);
> 	if (adapter->state != VNIC_PROBED)
> 		rc = __ibmvnic_set_mac(netdev, addr->sa_data);
> 
> So if state == VNIC_PROBED, the user can assign an invalid address to
> adapter->mac_addr, and ibmvnic_set_mac() will still return 0.
> 
> The fix is to validate ethernet address at the beginning of
> ibmvnic_set_mac(), and move the ether_addr_copy to
> the case of "adapter->state != VNIC_PROBED".
> 
> Fixes: 62740e97881c ("net/ibmvnic: Update MAC address settings after adapter reset")
> Cc: Jakub Kicinski <kuba@...nel.org>
> Signed-off-by: Lijun Pan <ljp@...ux.ibm.com>

Applied, thanks.