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authorPavel Emelyanov <xemul@openvz.org>2008-02-26 23:51:04 -0800
committerDavid S. Miller <davem@davemloft.net>2008-02-26 23:51:04 -0800
commitb37d428b24ad38034f56b614de05686ba151b614 (patch)
treedfa41745c88edb80a47c246d13a899ee06a7510f /net/ipv6/ip6_tunnel.c
parentd9595a7b9c777d45a74774f1428c263a0a47f4c0 (diff)
[INET]: Don't create tunnels with '%' in name.
Four tunnel drivers (ip_gre, ipip, ip6_tunnel and sit) can receive a pre-defined name for a device from the userspace. Since these drivers call the register_netdevice() (rtnl_lock, is held), which does _not_ generate the device's name, this name may contain a '%' character. Not sure how bad is this to have a device with a '%' in its name, but all the other places either use the register_netdev(), which call the dev_alloc_name(), or explicitly call the dev_alloc_name() before registering, i.e. do not allow for such names. This had to be prior to the commit 34cc7b, but I forgot to number the patches and this one got lost, sorry. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_tunnel.c')
-rw-r--r--net/ipv6/ip6_tunnel.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 2a124e9a1b2d..78f438880923 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -238,17 +238,24 @@ static struct ip6_tnl *ip6_tnl_create(struct ip6_tnl_parm *p)
if (dev == NULL)
goto failed;
+ if (strchr(name, '%')) {
+ if (dev_alloc_name(dev, name) < 0)
+ goto failed_free;
+ }
+
t = netdev_priv(dev);
dev->init = ip6_tnl_dev_init;
t->parms = *p;
- if ((err = register_netdevice(dev)) < 0) {
- free_netdev(dev);
- goto failed;
- }
+ if ((err = register_netdevice(dev)) < 0)
+ goto failed_free;
+
dev_hold(dev);
ip6_tnl_link(t);
return t;
+
+failed_free:
+ free_netdev(dev);
failed:
return NULL;
}