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| author | Mahesh Bandewar <maheshb@google.com> | 2016-09-01 22:18:34 -0700 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2017-02-10 11:03:47 +0100 |
| commit | 745db35452567cca10e92a2b0c70d85494c1ad0e (patch) | |
| tree | 78a2d2245ab4b5a6361b258097c0218a2c1c1249 /drivers | |
| parent | 56325d9fb7b138b228577ae99382b70084ab82f3 (diff) | |
| download | linux-745db35452567cca10e92a2b0c70d85494c1ad0e.tar.gz linux-745db35452567cca10e92a2b0c70d85494c1ad0e.tar.bz2 linux-745db35452567cca10e92a2b0c70d85494c1ad0e.zip | |
bonding: Fix bonding crash
commit 24b27fc4cdf9e10c5e79e5923b6b7c2c5c95096c upstream.
Following few steps will crash kernel -
(a) Create bonding master
> modprobe bonding miimon=50
(b) Create macvlan bridge on eth2
> ip link add link eth2 dev mvl0 address aa:0:0:0:0:01 \
type macvlan
(c) Now try adding eth2 into the bond
> echo +eth2 > /sys/class/net/bond0/bonding/slaves
<crash>
Bonding does lots of things before checking if the device enslaved is
busy or not.
In this case when the notifier call-chain sends notifications, the
bond_netdev_event() assumes that the rx_handler /rx_handler_data is
registered while the bond_enslave() hasn't progressed far enough to
register rx_handler for the new slave.
This patch adds a rx_handler check that can be performed right at the
beginning of the enslave code to avoid getting into this situation.
Signed-off-by: Mahesh Bandewar <maheshb@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index c0ed7c802819..ce41616d9d1a 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -1565,9 +1565,10 @@ int bond_enslave(struct net_device *bond_dev, struct net_device *slave_dev) bond_dev->name, slave_dev->name); } - /* already enslaved */ - if (slave_dev->flags & IFF_SLAVE) { - pr_debug("Error, Device was already enslaved\n"); + /* already in-use? */ + if (netdev_is_rx_handler_busy(slave_dev)) { + netdev_err(bond_dev, + "Error: Device is in use and cannot be enslaved\n"); return -EBUSY; } |