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

stable inclusion
from stable-v5.10.125
commit 16b1994679a0ad7f12a3b40b928e70241303d6f4
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5L6EY

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=16b1994679a0ad7f12a3b40b928e70241303d6f4

--------------------------------

commit b337af3a 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 890d5b40 ("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: 890d5b40 ("usb: gadget: u_ether: fix race in setting MAC address in setup phase")
Cc: stable@vger.kernel.org
Signed-off-by: NMarian Postevca <posteuca@mutex.one>
Link: https://lore.kernel.org/r/20220603153459.32722-1-posteuca@mutex.oneSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

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);