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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>
This commit is contained in:
Jarod Wilson 2020-07-08 18:58:49 -04:00 committed by David S. Miller
parent 7d25e14eb2
commit f548a47626
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/net/bonding/bond_main.c
View File

@ -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)