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ip6_tunnel: better validate user provided tunnel names 

Use valid_name() to make sure user does not provide illegal
device name.

Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2018-04-05 06:39:30 -07:00 committed by David S. Miller
parent 5f42df013b
commit db7a65e3ab
1 changed files with 7 additions and 4 deletions
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11
net/ipv6/ip6_tunnel.c
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@ -297,13 +297,16 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
struct net_device *dev;
struct ip6_tnl *t;
char name[IFNAMSIZ];
int err = -ENOMEM;
int err = -E2BIG;
if (p->name[0])
if (p->name[0]) {
if (!dev_valid_name(p->name))
goto failed;
strlcpy(name, p->name, IFNAMSIZ);
else
} else {
sprintf(name, "ip6tnl%%d");
}
err = -ENOMEM;
dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
ip6_tnl_dev_setup);
if (!dev)