From: Eric Dumazet <eduma...@google.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 <eduma...@google.com>
> Reported-by: syzbot <syzkal...@googlegroups.com>
> Cc: Guillaume Nault <g.na...@alphalink.fr>
Applied, thanks Eric.
