diff options
| author | Taehee Yoo <ap420073@gmail.com> | 2021-07-05 15:38:13 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-07-06 10:36:59 -0700 |
| commit | 955b785ec6b3b2f9b91914d6eeac8ee66ee29239 (patch) | |
| tree | 39994efd4ad6d73148175d7fad8535ec39ee8185 | |
| parent | 9a5605505d9c7dbfdb89cc29a8f5fc5cf9fd2334 (diff) | |
| download | linux-955b785ec6b3b2f9b91914d6eeac8ee66ee29239.tar.bz2 | |
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>
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 165fa55cfb38..780f87869e36 100644 --- 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 = { |