From: Hangbin Liu liuhangbin@gmail.com
[ Upstream commit 925b0c841e066b488cc3a60272472b2c56300704 ]
If we add a bond device which is already the master of the team interface, we will hold the team->lock in team_add_slave() first and then request the lock in team_set_mac_address() again. The functions are called like:
- team_add_slave() - team_port_add() - team_port_enter() - team_modeop_port_enter() - __set_port_dev_addr() - dev_set_mac_address() - bond_set_mac_address() - dev_set_mac_address() - team_set_mac_address
Although team_upper_dev_link() would check the upper devices but it is called too late. Fix it by adding a checking before processing the slave.
v2: Do not split the string in netdev_err()
Fixes: 3d249d4ca7d0 ("net: introduce ethernet teaming device") Acked-by: Jiri Pirko jiri@mellanox.com Signed-off-by: Hangbin Liu liuhangbin@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/team/team.c | 6 ++++++ 1 file changed, 6 insertions(+)
--- a/drivers/net/team/team.c +++ b/drivers/net/team/team.c @@ -1137,6 +1137,12 @@ static int team_port_add(struct team *te return -EINVAL; }
+ if (netdev_has_upper_dev(dev, port_dev)) { + netdev_err(dev, "Device %s is already an upper device of the team interface\n", + portname); + return -EBUSY; + } + if (port_dev->features & NETIF_F_VLAN_CHALLENGED && vlan_uses_dev(dev)) { netdev_err(dev, "Device %s is VLAN challenged and team device has VLAN set up\n",