[PATCHv3 3/5] bonding: primary_slave & curr_active_slave are not cleaned on enslave failure

[Nikolay Aleksandrov <nikolay@redhat.com>]

On enslave failure primary_slave can point to new_slave which is to be
freed, and the same applies to curr_active_slave. So check if this is
the case and clean up properly after err_detach because that's the first
error code path after they're set.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
---
 drivers/net/bonding/bond_main.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 2e7fce0..c56e132 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -1909,7 +1909,17 @@ err_detach:
 	bond_del_vlans_from_slave(bond, slave_dev);
 	write_lock_bh(&bond->lock);
 	bond_detach_slave(bond, new_slave);
+	if (bond->primary_slave == new_slave)
+		bond->primary_slave = NULL;
 	write_unlock_bh(&bond->lock);
+	if (bond->curr_active_slave == new_slave) {
+		read_lock(&bond->lock);
+		write_lock_bh(&bond->curr_slave_lock);
+		bond_change_active_slave(bond, NULL);
+		bond_select_active_slave(bond);
+		write_unlock_bh(&bond->curr_slave_lock);
+		read_unlock(&bond->lock);
+	}
 
 err_close:
 	slave_dev->priv_flags &= ~IFF_BONDING;
-- 
1.8.1.4