bonding: fix suspicious RCU usage in bond_ipsec_offload_ok()

To dereference bond->curr_active_slave, it uses rcu_dereference().
But it and the caller doesn't acquire RCU so a warning occurs.
So add rcu_read_lock().

Splat looks like:
WARNING: suspicious RCU usage
5.13.0-rc6+ #1179 Not tainted
drivers/net/bonding/bond_main.c:571 suspicious
rcu_dereference_check() usage!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1
1 lock held by ping/974:
 #0: ffff888109e7db70 (sk_lock-AF_INET){+.+.}-{0:0},
at: raw_sendmsg+0x1303/0x2cb0

stack backtrace:
CPU: 2 PID: 974 Comm: ping Not tainted 5.13.0-rc6+ #1179
Call Trace:
 dump_stack+0xa4/0xe5
 bond_ipsec_offload_ok+0x1f4/0x260 [bonding]
 xfrm_output+0x179/0x890
 xfrm4_output+0xfa/0x410
 ? __xfrm4_output+0x4b0/0x4b0
 ? __ip_make_skb+0xecc/0x2030
 ? xfrm4_udp_encap_rcv+0x800/0x800
 ? ip_local_out+0x21/0x3a0
 ip_send_skb+0x37/0xa0
 raw_sendmsg+0x1bfd/0x2cb0

Fixes: 18cb261afd7b ("bonding: support hardware encryption offload to slaves")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 165fa55..780f878 100644 (file)
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -573,24 +573,34 @@ static bool bond_ipsec_offload_ok(struct sk_buff *skb, struct xfrm_state *xs)
        struct net_device *real_dev;
        struct slave *curr_active;
        struct bonding *bond;
+       int err;
 
        bond = netdev_priv(bond_dev);
+       rcu_read_lock();
        curr_active = rcu_dereference(bond->curr_active_slave);
        real_dev = curr_active->dev;
 
-       if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP)
-               return true;
+       if (BOND_MODE(bond) != BOND_MODE_ACTIVEBACKUP) {
+               err = true;
+               goto out;
+       }
 
-       if (!xs->xso.real_dev)
-               return false;
+       if (!xs->xso.real_dev) {
+               err = false;
+               goto out;
+       }
 
        if (!real_dev->xfrmdev_ops ||
            !real_dev->xfrmdev_ops->xdo_dev_offload_ok ||
            netif_is_bond_master(real_dev)) {
-               return false;
+               err = false;
+               goto out;
        }
 
-       return real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
+       err = real_dev->xfrmdev_ops->xdo_dev_offload_ok(skb, xs);
+out:
+       rcu_read_unlock();
+       return err;
 }
 
 static const struct xfrmdev_ops bond_xfrmdev_ops = {