From: Marian Postevca posteuca@mutex.one
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 --- drivers/usb/gadget/function/u_ether.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-)
--- a/drivers/usb/gadget/function/u_ether.c +++ b/drivers/usb/gadget/function/u_ether.c @@ -775,9 +775,13 @@ struct eth_dev *gether_setup_name(struct dev->qmult = qmult; snprintf(net->name, sizeof(net->name), "%s%%d", netname);
- if (get_ether_addr(dev_addr, addr)) + if (get_ether_addr(dev_addr, 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; + } eth_hw_addr_set(net, addr); if (get_ether_addr(host_addr, dev->host_mac)) dev_warn(&g->dev, @@ -844,6 +848,10 @@ struct net_device *gether_setup_name_def
eth_random_addr(dev->dev_mac); pr_warn("using random %s ethernet address\n", "self"); + + /* by default we always have a random MAC address */ + net->addr_assign_type = NET_ADDR_RANDOM; + eth_random_addr(dev->host_mac); pr_warn("using random %s ethernet address\n", "host");
@@ -871,7 +879,6 @@ int gether_register_netdev(struct net_de dev = netdev_priv(net); g = dev->gadget;
- net->addr_assign_type = NET_ADDR_RANDOM; eth_hw_addr_set(net, dev->dev_mac);
status = register_netdev(net); @@ -912,6 +919,7 @@ int gether_set_dev_addr(struct net_devic 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);