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tun: allow positive return values on dev_get_valid_name() call

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[ 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>
This commit is contained in:
Julien Gomes 2017-10-25 11:50:50 -07:00 committed by Greg Kroah-Hartman
parent d6b1aebcd7
commit 210a641873
1 changed files with 1 additions and 1 deletions
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2
drivers/net/tun.c
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@ -1788,7 +1788,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
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);