forked from Minki/linux
bonding: don't need RTNL for ipsec helpers
The bond_ipsec_* helpers don't need RTNL, and can potentially get called without it being held, so switch from rtnl_dereference() to rcu_dereference() to access bond struct data. Lightly tested with xfrm bonding, no problems found, should address the syzkaller bug referenced below. Reported-by: syzbot+582c98032903dcc04816@syzkaller.appspotmail.com CC: Huy Nguyen <huyn@mellanox.com> CC: Saeed Mahameed <saeedm@mellanox.com> CC: Jay Vosburgh <j.vosburgh@gmail.com> CC: Veaceslav Falico <vfalico@gmail.com> CC: Andy Gospodarek <andy@greyhouse.net> CC: "David S. Miller" <davem@davemloft.net> CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com> CC: Jakub Kicinski <kuba@kernel.org> CC: Steffen Klassert <steffen.klassert@secunet.com> CC: Herbert Xu <herbert@gondor.apana.org.au> CC: netdev@vger.kernel.org CC: intel-wired-lan@lists.osuosl.org Signed-off-by: Jarod Wilson <jarod@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -390,7 +390,7 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs)
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return -EINVAL;
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bond = netdev_priv(bond_dev);
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slave = rtnl_dereference(bond->curr_active_slave);
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slave = rcu_dereference(bond->curr_active_slave);
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xs->xso.real_dev = slave->dev;
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bond->xs = xs;
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@ -417,7 +417,7 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs)
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return;
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bond = netdev_priv(bond_dev);
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slave = rtnl_dereference(bond->curr_active_slave);
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slave = rcu_dereference(bond->curr_active_slave);
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if (!slave)
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return;
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@ -442,7 +442,7 @@ static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
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{
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struct net_device *bond_dev = xs->xso.dev;
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struct bonding *bond = netdev_priv(bond_dev);
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struct slave *curr_active = rtnl_dereference(bond->curr_active_slave);
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struct slave *curr_active = rcu_dereference(bond->curr_active_slave);
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struct net_device *slave_dev = curr_active->dev;
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if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
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