From: Sabrina Dubroca sd@queasysnail.net
[ Upstream commit 92480b3977fd3884649d404cbbaf839b70035699 ]
When a bond is enslaved to another bond, bond_netdev_event() only handles the event as if the bond is a master, and skips treating the bond as a slave.
This leads to a refcount leak on the slave, since we don't remove the adjacency to its master and the master holds a reference on the slave.
Reproducer: ip link add bondL type bond ip link add bondU type bond ip link set bondL master bondU ip link del bondL
No "Fixes:" tag, this code is older than git history.
Signed-off-by: Sabrina Dubroca sd@queasysnail.net Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/bonding/bond_main.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2958,8 +2958,12 @@ static int bond_netdev_event(struct noti return NOTIFY_DONE;
if (event_dev->flags & IFF_MASTER) { + int ret; + netdev_dbg(event_dev, "IFF_MASTER\n"); - return bond_master_netdev_event(event, event_dev); + ret = bond_master_netdev_event(event, event_dev); + if (ret != NOTIFY_DONE) + return ret; }
if (event_dev->flags & IFF_SLAVE) {