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tun: Don't add sysfs attributes to devices without sysfs directories

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This applies to 2.6.32 *only*.  It has not been applied upstream since
the limitation no longer exists.

Prior to Linux 2.6.35, net devices outside the initial net namespace
did not have sysfs directories.  Attempting to add attributes to
them will trigger a BUG().

Reported-and-tested-by: Russell Stuart <russell-debian@stuart.id.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Ben Hutchings 2010-09-09 05:21:16 +01:00 committed by Greg Kroah-Hartman
parent 88c0bb95c7
commit 11bb28b416
1 changed files with 2 additions and 1 deletions
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3
drivers/net/tun.c
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@ -1006,7 +1006,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
if (err < 0)
goto err_free_sk;
if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
if (!net_eq(dev_net(tun->dev), &init_net) ||
device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
device_create_file(&tun->dev->dev, &dev_attr_group))
printk(KERN_ERR "Failed to create tun sysfs files\n");