diff options
| author | nikolay@redhat.com <nikolay@redhat.com> | 2013-02-18 07:59:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-02-19 00:51:08 -0500 |
| commit | b59340c2c0508d280f10658ad662fa56a39c74c2 (patch) | |
| tree | 459621b4f850ef838078bf1033cfd32bc0923acf | |
| parent | ccae0e50c16a7f7adb029c169147400d1ce9f703 (diff) | |
| download | op-kernel-dev-b59340c2c0508d280f10658ad662fa56a39c74c2.zip op-kernel-dev-b59340c2c0508d280f10658ad662fa56a39c74c2.tar.gz | |
bonding: Fix race condition between bond_enslave() and bond_3ad_update_lacp_rate()
port->slave can be NULL since it's being initialized in bond_enslave
thus dereferencing a NULL pointer in bond_3ad_update_lacp_rate()
Also fix a minor bug, which could cause a port not to have
AD_STATE_LACP_TIMEOUT since there's no sync between
bond_3ad_update_lacp_rate() and bond_3ad_bind_slave(), by changing
the read_lock to a write_lock_bh in bond_3ad_update_lacp_rate().
Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/bonding/bond_3ad.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index 84fabd6..0e45b40 100644 --- a/drivers/net/bonding/bond_3ad.c +++ b/drivers/net/bonding/bond_3ad.c @@ -2494,11 +2494,13 @@ void bond_3ad_update_lacp_rate(struct bonding *bond) struct port *port = NULL; int lacp_fast; - read_lock(&bond->lock); + write_lock_bh(&bond->lock); lacp_fast = bond->params.lacp_fast; bond_for_each_slave(bond, slave, i) { port = &(SLAVE_AD_INFO(slave).port); + if (port->slave == NULL) + continue; __get_state_machine_lock(port); if (lacp_fast) port->actor_oper_port_state |= AD_STATE_LACP_TIMEOUT; @@ -2507,5 +2509,5 @@ void bond_3ad_update_lacp_rate(struct bonding *bond) __release_state_machine_lock(port); } - read_unlock(&bond->lock); + write_unlock_bh(&bond->lock); } |
