From: nikolay@redhat.com Date: Mon, 18 Feb 2013 07:59:02 +0000 (+0000) Subject: bonding: Fix race condition between bond_enslave() and bond_3ad_update_lacp_rate() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b59340c2c0508d280f10658ad662fa56a39c74c2;p=linux-beck.git 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 Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller --- diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index 84fabd69df4c..0e45b400b6fc 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); }