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| author | Eric W. Biederman <ebiederm@xmission.com> | 2011-10-20 04:26:01 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-10-21 02:53:06 -0400 |
| commit | 99f34b38cdc8f75a4b9adb5a617b118253b3efe1 (patch) | |
| tree | 07197b487004886a51a47c8fb4fe94e9e5bdc6a9 /drivers/net/macvtap.c | |
| parent | 4b727361f0bc7ee7378298941066d8aa15023ffb (diff) | |
| download | linux-99f34b38cdc8f75a4b9adb5a617b118253b3efe1.tar.gz linux-99f34b38cdc8f75a4b9adb5a617b118253b3efe1.tar.xz linux-99f34b38cdc8f75a4b9adb5a617b118253b3efe1.zip | |
macvtap: Close a race between macvtap_open and macvtap_dellink.
There is a small window in macvtap_open between looking up a
networking device and calling macvtap_set_queue in which
macvtap_del_queues called from macvtap_dellink. After
calling macvtap_del_queues it is totally incorrect to
allow macvtap_set_queue to proceed so prevent success by
reporting that all of the available queues are in use.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/macvtap.c')
| -rw-r--r-- | drivers/net/macvtap.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c index 3da557830937..70aa628834f0 100644 --- a/drivers/net/macvtap.c +++ b/drivers/net/macvtap.c @@ -231,6 +231,8 @@ static void macvtap_del_queues(struct net_device *dev) } } BUG_ON(vlan->numvtaps != 0); + /* guarantee that any future macvtap_set_queue will fail */ + vlan->numvtaps = MAX_MACVTAP_QUEUES; spin_unlock(&macvtap_lock); synchronize_rcu(); |