From 22ab1f8751fa079b818d579cfb0bedfea5ba15e2 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Mon, 26 Mar 2018 01:16:46 +0800 Subject: [PATCH] bonding: move dev_mc_sync after master_upper_dev_link in bond_enslave [ Upstream commit ae42cc62a9f07f1f6979054ed92606b9c30f4a2e ] Beniamino found a crash when adding vlan as slave of bond which is also the parent link: ip link add bond1 type bond ip link set bond1 up ip link add link bond1 vlan1 type vlan id 80 ip link set vlan1 master bond1 The call trace is as below: [] queued_spin_lock_slowpath+0xb/0xf [] _raw_spin_lock+0x20/0x30 [] dev_mc_sync+0x37/0x80 [] vlan_dev_set_rx_mode+0x1c/0x30 [8021q] [] __dev_set_rx_mode+0x5a/0xa0 [] dev_mc_sync_multiple+0x78/0x80 [] bond_enslave+0x67c/0x1190 [bonding] [] do_setlink+0x9c9/0xe50 [] rtnl_newlink+0x522/0x880 [] rtnetlink_rcv_msg+0xa7/0x260 [] netlink_rcv_skb+0xab/0xc0 [] rtnetlink_rcv+0x28/0x30 [] netlink_unicast+0x170/0x210 [] netlink_sendmsg+0x308/0x420 [] sock_sendmsg+0xb6/0xf0 This is actually a dead lock caused by sync slave hwaddr from master when the master is the slave's 'slave'. This dead loop check is actually done by netdev_master_upper_dev_link. However, Commit 1f718f0f4f97 ("bonding: populate neighbour's private on enslave") moved it after dev_mc_sync. This patch is to fix it by moving dev_mc_sync after master_upper_dev_link, so that this loop check would be earlier than dev_mc_sync. It also moves if (mode == BOND_MODE_8023AD) into if (!bond_uses_primary) clause as an improvement. Note team driver also has this issue, I will fix it in another patch. Fixes: 1f718f0f4f97 ("bonding: populate neighbour's private on enslave") Reported-by: Beniamino Galvani Signed-off-by: Xin Long Acked-by: Andy Gospodarek Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- drivers/net/bonding/bond_main.c | 73 ++++++++++++++++----------------- 1 file changed, 35 insertions(+), 38 deletions(-) diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 5c99c0f1f01d..b8701a07f4eb 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1524,44 +1524,11 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) goto err_close; } - /* If the mode uses primary, then the following is handled by - * bond_change_active_slave(). - */ - if (!bond_uses_primary(bond)) { - /* set promiscuity level to new slave */ - if (bond_dev->flags & IFF_PROMISC) { - res = dev_set_promiscuity(slave_dev, 1); - if (res) - goto err_close; - } - - /* set allmulti level to new slave */ - if (bond_dev->flags & IFF_ALLMULTI) { - res = dev_set_allmulti(slave_dev, 1); - if (res) - goto err_close; - } - - netif_addr_lock_bh(bond_dev); - - dev_mc_sync_multiple(slave_dev, bond_dev); - dev_uc_sync_multiple(slave_dev, bond_dev); - - netif_addr_unlock_bh(bond_dev); - } - - if (BOND_MODE(bond) == BOND_MODE_8023AD) { - /* add lacpdu mc addr to mc list */ - u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; - - dev_mc_add(slave_dev, lacpdu_multicast); - } - res = vlan_vids_add_by_dev(slave_dev, bond_dev); if (res) { netdev_err(bond_dev, "Couldn't add bond vlan ids to %s\n", slave_dev->name); - goto err_hwaddr_unsync; + goto err_close; } prev_slave = bond_last_slave(bond); @@ -1721,6 +1688,37 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) goto err_upper_unlink; } + /* If the mode uses primary, then the following is handled by + * bond_change_active_slave(). + */ + if (!bond_uses_primary(bond)) { + /* set promiscuity level to new slave */ + if (bond_dev->flags & IFF_PROMISC) { + res = dev_set_promiscuity(slave_dev, 1); + if (res) + goto err_sysfs_del; + } + + /* set allmulti level to new slave */ + if (bond_dev->flags & IFF_ALLMULTI) { + res = dev_set_allmulti(slave_dev, 1); + if (res) + goto err_sysfs_del; + } + + netif_addr_lock_bh(bond_dev); + dev_mc_sync_multiple(slave_dev, bond_dev); + dev_uc_sync_multiple(slave_dev, bond_dev); + netif_addr_unlock_bh(bond_dev); + + if (BOND_MODE(bond) == BOND_MODE_8023AD) { + /* add lacpdu mc addr to mc list */ + u8 lacpdu_multicast[ETH_ALEN] = MULTICAST_LACPDU_ADDR; + + dev_mc_add(slave_dev, lacpdu_multicast); + } + } + bond->slave_cnt++; bond_compute_features(bond); bond_set_carrier(bond); @@ -1744,6 +1742,9 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) return 0; /* Undo stages on error */ +err_sysfs_del: + bond_sysfs_slave_del(new_slave); + err_upper_unlink: bond_upper_dev_unlink(bond, new_slave); @@ -1764,10 +1765,6 @@ err_detach: synchronize_rcu(); slave_disable_netpoll(new_slave); -err_hwaddr_unsync: - if (!bond_uses_primary(bond)) - bond_hw_addr_flush(bond_dev, slave_dev); - err_close: slave_dev->priv_flags &= ~IFF_BONDING; dev_close(slave_dev); -- 2.20.1