usb: gadget: u_ether: fix regression in setting fixed MAC address

commit b337af3a4d6147000b7ca6b3438bf5c820849b37 upstream.

In systemd systems setting a fixed MAC address through
the "dev_addr" module argument fails systematically.
When checking the MAC address after the interface is created
it always has the same but different MAC address to the one
supplied as argument.

This is partially caused by systemd which by default will
set an internally generated permanent MAC address for interfaces
that are marked as having a randomly generated address.

Commit 890d5b40908bfd1a ("usb: gadget: u_ether: fix race in
setting MAC address in setup phase") didn't take into account
the fact that the interface must be marked as having a set
MAC address when it's set as module argument.

Fixed by marking the interface with NET_ADDR_SET when
the "dev_addr" module argument is supplied.

Fixes: 890d5b40908bfd1a ("usb: gadget: u_ether: fix race in setting MAC address in setup phase")
Cc: stable@vger.kernel.org
Signed-off-by: Marian Postevca <posteuca@mutex.one>
Link: https://lore.kernel.org/r/20220603153459.32722-1-posteuca@mutex.one
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index a40be8b448c240d30f7e3493eb9441051d86c32c..64ef97ab9274aebec2b4483c44a7159336061b13 100644 (file)
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -772,9 +772,13 @@ struct eth_dev *gether_setup_name(struct usb_gadget *g,
        dev->qmult = qmult;
        snprintf(net->name, sizeof(net->name), "%s%%d", netname);
 
-       if (get_ether_addr(dev_addr, net->dev_addr))
+       if (get_ether_addr(dev_addr, net->dev_addr)) {
+               net->addr_assign_type = NET_ADDR_RANDOM;
                dev_warn(&g->dev,
                        "using random %s ethernet address\n", "self");
+       } else {
+               net->addr_assign_type = NET_ADDR_SET;
+       }
        if (get_ether_addr(host_addr, dev->host_mac))
                dev_warn(&g->dev,
                        "using random %s ethernet address\n", "host");
@@ -831,6 +835,9 @@ struct net_device *gether_setup_name_default(const char *netname)
        INIT_LIST_HEAD(&dev->tx_reqs);
        INIT_LIST_HEAD(&dev->rx_reqs);
 
+       /* by default we always have a random MAC address */
+       net->addr_assign_type = NET_ADDR_RANDOM;
+
        skb_queue_head_init(&dev->rx_frames);
 
        /* network device setup */
@@ -868,7 +875,6 @@ int gether_register_netdev(struct net_device *net)
        g = dev->gadget;
 
        memcpy(net->dev_addr, dev->dev_mac, ETH_ALEN);
-       net->addr_assign_type = NET_ADDR_RANDOM;
 
        status = register_netdev(net);
        if (status < 0) {
@@ -908,6 +914,7 @@ int gether_set_dev_addr(struct net_device *net, const char *dev_addr)
        if (get_ether_addr(dev_addr, new_addr))
                return -EINVAL;
        memcpy(dev->dev_mac, new_addr, ETH_ALEN);
+       net->addr_assign_type = NET_ADDR_SET;
        return 0;
 }
 EXPORT_SYMBOL_GPL(gether_set_dev_addr);