diff options
| author | Zefan Li <lizefan@huawei.com> | 2013-06-26 15:29:54 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2013-07-27 05:34:21 +0100 |
| commit | 20156bcf0895e1dcde7b0b3ef6e8614cfd5fab10 (patch) | |
| tree | 58d869eaaa9cd97a18a364243098766a38c500bd | |
| parent | 0922d9a16733658dd91a1aa9e543d9e03a4f3aa2 (diff) | |
dlci: acquire rtnl_lock before calling __dev_get_by_name()
commit 11eb2645cbf38a08ae491bf6c602eea900ec0bb5 upstream.
Otherwise the net device returned can be freed at anytime.
Signed-off-by: Li Zefan <lizefan@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | drivers/net/wan/dlci.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/drivers/net/wan/dlci.c b/drivers/net/wan/dlci.c index 48ab38a34c5..fa8d72cefb3 100644 --- a/drivers/net/wan/dlci.c +++ b/drivers/net/wan/dlci.c @@ -386,20 +386,24 @@ static int dlci_del(struct dlci_add *dlci) struct net_device *master, *slave; int err; + rtnl_lock(); + /* validate slave device */ master = __dev_get_by_name(&init_net, dlci->devname); - if (!master) - return -ENODEV; + if (!master) { + err = -ENODEV; + goto out; + } if (netif_running(master)) { - return -EBUSY; + err = -EBUSY; + goto out; } dlp = netdev_priv(master); slave = dlp->slave; flp = netdev_priv(slave); - rtnl_lock(); err = (*flp->deassoc)(slave, master); if (!err) { list_del(&dlp->list); @@ -408,8 +412,8 @@ static int dlci_del(struct dlci_add *dlci) dev_put(slave); } +out: rtnl_unlock(); - return err; } |