From f548a476268d621846bb0146af861bb56250ae37 Mon Sep 17 00:00:00 2001 From: Jarod Wilson Date: Wed, 8 Jul 2020 18:58:49 -0400 Subject: [PATCH] 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 CC: Saeed Mahameed CC: Jay Vosburgh CC: Veaceslav Falico CC: Andy Gospodarek CC: "David S. Miller" CC: Jeff Kirsher CC: Jakub Kicinski CC: Steffen Klassert CC: Herbert Xu CC: netdev@vger.kernel.org CC: intel-wired-lan@lists.osuosl.org Signed-off-by: Jarod Wilson Signed-off-by: David S. Miller --- drivers/net/bonding/bond_main.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index f886d97c43593..e2d491c4378c9 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -390,7 +390,7 @@ static int bond_ipsec_add_sa(struct xfrm_state *xs) return -EINVAL; bond = netdev_priv(bond_dev); - slave = rtnl_dereference(bond->curr_active_slave); + slave = rcu_dereference(bond->curr_active_slave); xs->xso.real_dev = slave->dev; bond->xs = xs; @@ -417,7 +417,7 @@ static void bond_ipsec_del_sa(struct xfrm_state *xs) return; bond = netdev_priv(bond_dev); - slave = rtnl_dereference(bond->curr_active_slave); + slave = rcu_dereference(bond->curr_active_slave); if (!slave) return; @@ -442,7 +442,7 @@ static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs) { struct net_device *bond_dev = xs->xso.dev; struct bonding *bond = netdev_priv(bond_dev); - struct slave *curr_active = rtnl_dereference(bond->curr_active_slave); + struct slave *curr_active = rcu_dereference(bond->curr_active_slave); struct net_device *slave_dev = curr_active->dev; if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) -- 2.30.2