Fri, Apr 12, 2019 at 03:04:10PM CEST, s...@queasysnail.net wrote:
>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
Out of curiosity, what is a usecase of stacked bonds? I don't see any.
>
>No "Fixes:" tag, this code is older than git history.
>
>Signed-off-by: Sabrina Dubroca <s...@queasysnail.net>
>---
>I also spotted some lockdep warnings when I started stacking random
>devices on top of random devices, I'm trying to clean that up too, but
>this fix is independent of that.
>
> drivers/net/bonding/bond_main.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
>index b59708c35faf..ee610721098e 100644
>--- a/drivers/net/bonding/bond_main.c
>+++ b/drivers/net/bonding/bond_main.c
>@@ -3213,8 +3213,12 @@ static int bond_netdev_event(struct notifier_block
>*this,
> 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) {
>--
>2.21.0
>
