netdev - Re: [PATCH net] l2ip: fix possible use-after-free

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Message-Id: <20190430.113931.1930596224086750181.davem@davemloft.net>
Date:   Tue, 30 Apr 2019 11:39:31 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     edumazet@...gle.com
Cc:     netdev@...r.kernel.org, eric.dumazet@...il.com,
        syzkaller@...glegroups.com, g.nault@...halink.fr
Subject: Re: [PATCH net] l2ip: fix possible use-after-free

From: Eric Dumazet <edumazet@...gle.com>
Date: Tue, 30 Apr 2019 06:27:58 -0700

> Before taking a refcount on a rcu protected structure,
> we need to make sure the refcount is not zero.
> 
> syzbot reported :
 ...
> Fixes: 54652eb12c1b ("l2tp: hold tunnel while looking up sessions in l2tp_netlink")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Cc: Guillaume Nault <g.nault@...halink.fr>

Applied, thanks Eric.