6.12-stable review patch. If anyone has any objections, please let me know.
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From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit 35ae4e86292ef7dfe4edbb9942955c884e984352 ]
After commit 5c3bf6cba791 ("bonding: assign random address if device address is same as bond"), bonding will erroneously randomize the MAC address of the first interface added to the bond if fail_over_mac = follow.
Correct this by additionally testing for the bond being empty before randomizing the MAC.
Fixes: 5c3bf6cba791 ("bonding: assign random address if device address is same as bond") Reported-by: Qiuling Ren qren@redhat.com Signed-off-by: Hangbin Liu liuhangbin@gmail.com Link: https://patch.msgid.link/20250910024336.400253-1-liuhangbin@gmail.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/bonding/bond_main.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 52ff0f9e04e07..952737a98751e 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2117,6 +2117,7 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev, memcpy(ss.__data, bond_dev->dev_addr, bond_dev->addr_len); } else if (bond->params.fail_over_mac == BOND_FOM_FOLLOW && BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP && + bond_has_slaves(bond) && memcmp(slave_dev->dev_addr, bond_dev->dev_addr, bond_dev->addr_len) == 0) { /* Set slave to random address to avoid duplicate mac * address in later fail over.