netdev - Re: [PATCH net] bonding: fix event handling for stacked bonds

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Message-Id: <20190415.132300.1393304596588046569.davem@davemloft.net>
Date:   Mon, 15 Apr 2019 13:23:00 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     sd@...asysnail.net
Cc:     netdev@...r.kernel.org, j.vosburgh@...il.com, vfalico@...il.com,
        andy@...yhouse.net, jarod@...hat.com
Subject: Re: [PATCH net] bonding: fix event handling for stacked bonds

From: Sabrina Dubroca <sd@...asysnail.net>
Date: Fri, 12 Apr 2019 15:04:10 +0200

> 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@...asysnail.net>

Applied and queued up for -stable, thanks Sabrina.