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| author | Jiri Bohac <jbohac@suse.cz> | 2009-10-28 22:23:54 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-11-09 16:22:58 -0800 |
| commit | 44791e49b282eb1901b28d27d9756ace8f873dca (patch) | |
| tree | 6dee8d20e2821c8d8019dc9b364b6289e60df09c | |
| parent | 474ac4951f31a678cda82833c6ec6dbb4b58bacb (diff) | |
| download | lwn-44791e49b282eb1901b28d27d9756ace8f873dca.tar.gz lwn-44791e49b282eb1901b28d27d9756ace8f873dca.zip | |
bonding: fix a race condition in calls to slave MII ioctls
commit d9d5283228d0c752f199c901fff6e1405dc91bcb upstream.
In mii monitor mode, bond_check_dev_link() calls the the ioctl
handler of slave devices. It stores the ndo_do_ioctl function
pointer to a static (!) ioctl variable and later uses it to call the
handler with the IOCTL macro.
If another thread executes bond_check_dev_link() at the same time
(even with a different bond, which none of the locks prevent), a
race condition occurs. If the two racing slaves have different
drivers, this may result in one driver's ioctl handler being
called with a pointer to a net_device controlled with a different
driver, resulting in unpredictable breakage.
Unless I am overlooking something, the "static" must be a
copy'n'paste error (?).
Signed-off-by: Jiri Bohac <jbohac@suse.cz>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index aa1be1feceed..7029d5396757 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -691,7 +691,7 @@ static int bond_check_dev_link(struct bonding *bond, struct net_device *slave_dev, int reporting) { const struct net_device_ops *slave_ops = slave_dev->netdev_ops; - static int (*ioctl)(struct net_device *, struct ifreq *, int); + int (*ioctl)(struct net_device *, struct ifreq *, int); struct ifreq ifr; struct mii_ioctl_data *mii; |