[PATCH net v2 4/5] net: bcmgenet: validate Ethernet address in bcmgenet_set_mac_addr

bcmgenet_set_mac_addr() did not check whether the provided MAC address is a
valid Ethernet address before applying it. Userspace could configure an
invalid address (such as all zeroes or a multicast address) while the
interface is down.

Add a call to is_valid_ether_addr() and return -EADDRNOTAVAIL if the MAC
address is not valid.

Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Assisted-by: LLM
Reviewed-by: Nicolai Buchwitz <redacted>
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
 drivers/net/ethernet/broadcom/genet/bcmgenet.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index bfb74dca55d6..e9d9d3d7b636 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c

@@ -3634,6 +3634,9 @@ static int bcmgenet_set_mac_addr(struct net_device *dev, void *p)
 	if (netif_running(dev))
 		return -EBUSY;
 
+	if (!is_valid_ether_addr(addr->sa_data))
+		return -EADDRNOTAVAIL;
+
 	eth_hw_addr_set(dev, addr->sa_data);
 
 	return 0;

-- 
2.34.1