4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Julien Gomes julien@arista.com
[ Upstream commit 5c25f65fd1e42685f7ccd80e0621829c105785d9 ]
If the name argument of dev_get_valid_name() contains "%d", it will try to assign it a unit number in __dev__alloc_name() and return either the unit number (>= 0) or an error code (< 0). Considering positive values as error values prevent tun device creations relying this mechanism, therefor we should only consider negative values as errors here.
Signed-off-by: Julien Gomes julien@arista.com Acked-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/tun.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -1788,7 +1788,7 @@ static int tun_set_iff(struct net *net, if (!dev) return -ENOMEM; err = dev_get_valid_name(net, dev, name); - if (err) + if (err < 0) goto err_free_dev;
dev_net_set(dev, net);