4.19-stable review patch. If anyone has any objections, please let me know.
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From: Oliver Neukum oneukum@suse.com
[ Upstream commit bab8eb0dd4cb995caa4a0529d5655531c2ec5e8e ]
The driver generates a random MAC once on load and uses it over and over, including on two devices needing a random MAC at the same time.
Jakub suggested revamping the driver to the modern API for setting a random MAC rather than fixing the old stuff.
The bug is as old as the driver.
Signed-off-by: Oliver Neukum oneukum@suse.com Reviewed-by: Simon Horman horms@kernel.org Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Link: https://patch.msgid.link/20240829175201.670718-1-oneukum@suse.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/usbnet.c | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-)
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 16225654d88c..938335f4738d 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -79,9 +79,6 @@
/*-------------------------------------------------------------------------*/
-// randomly generated ethernet address -static u8 node_id [ETH_ALEN]; - /* use ethtool to change the level for any given device */ static int msg_level = -1; module_param (msg_level, int, 0); @@ -1725,7 +1722,6 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
dev->net = net; strscpy(net->name, "usb%d", sizeof(net->name)); - eth_hw_addr_set(net, node_id);
/* rx and tx sides can use different message sizes; * bind() should set rx_urb_size in that case. @@ -1799,9 +1795,9 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) goto out4; }
- /* let userspace know we have a random address */ - if (ether_addr_equal(net->dev_addr, node_id)) - net->addr_assign_type = NET_ADDR_RANDOM; + /* this flags the device for user space */ + if (!is_valid_ether_addr(net->dev_addr)) + eth_hw_addr_random(net);
if ((dev->driver_info->flags & FLAG_WLAN) != 0) SET_NETDEV_DEVTYPE(net, &wlan_type); @@ -2211,7 +2207,6 @@ static int __init usbnet_init(void) BUILD_BUG_ON( FIELD_SIZEOF(struct sk_buff, cb) < sizeof(struct skb_data));
- eth_random_addr(node_id); return 0; } module_init(usbnet_init);