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authorPavel Emelyanov <xemul@openvz.org>2008-02-27 10:51:04 +0300
committerDavid S. Miller <davem@davemloft.net>2008-02-27 10:51:04 +0300
commitb37d428b24ad38034f56b614de05686ba151b614 (patch)
treedfa41745c88edb80a47c246d13a899ee06a7510f /net/ipv4/ip_gre.c
parentd9595a7b9c777d45a74774f1428c263a0a47f4c0 (diff)
downloadlinux-b37d428b24ad38034f56b614de05686ba151b614.tar.xz
[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/ipv4/ip_gre.c')
-rw-r--r--net/ipv4/ip_gre.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 906cb1ada4c3..e7821ba7a9a0 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -266,20 +266,24 @@ static struct ip_tunnel * ipgre_tunnel_locate(struct ip_tunnel_parm *parms, int
if (!dev)
return NULL;
+ if (strchr(name, '%')) {
+ if (dev_alloc_name(dev, name) < 0)
+ goto failed_free;
+ }
+
dev->init = ipgre_tunnel_init;
nt = netdev_priv(dev);
nt->parms = *parms;
- if (register_netdevice(dev) < 0) {
- free_netdev(dev);
- goto failed;
- }
+ if (register_netdevice(dev) < 0)
+ goto failed_free;
dev_hold(dev);
ipgre_tunnel_link(nt);
return nt;
-failed:
+failed_free:
+ free_netdev(dev);
return NULL;
}