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authorJiri Bohac <jbohac@suse.cz>2009-10-28 22:23:54 -0700
committerDavid S. Miller <davem@davemloft.net>2009-10-28 22:23:54 -0700
commitd9d5283228d0c752f199c901fff6e1405dc91bcb (patch)
treea21bf48e33cff976c50ef4f77dcc012cdcac4871
parent03f191bab77c0148e458dbbd0a37241be2a2faf9 (diff)
downloadvexpress-lsk-d9d5283228d0c752f199c901fff6e1405dc91bcb.tar.gz
bonding: fix a race condition in calls to slave MII ioctls
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>
-rw-r--r--drivers/net/bonding/bond_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 3f05267b2cf..40fb5eefc72 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;