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tuntap: correctly handle error in tun_set_iff()

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Commit c8d68e6be1
(tuntap: multiqueue support) only call free_netdev() on error in
tun_set_iff(). This causes several issues:

- memory of tun security were leaked
- use after free since the flow gc timer was not deleted and the tfile
  were not detached

This patch solves the above issues.

Reported-by: Wannes Rombouts <wannes.rombouts@epitech.eu>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-09-11 18:09:48 +08:00 committed by David S. Miller
parent a9677bc024
commit 662ca437e7
1 changed files with 8 additions and 3 deletions
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11
drivers/net/tun.c
View File

@ -1641,11 +1641,11 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
INIT_LIST_HEAD(&tun->disabled);
err = tun_attach(tun, file, false);
if (err < 0)
goto err_free_dev;
goto err_free_flow;
err = register_netdevice(tun->dev);
if (err < 0)
goto err_free_dev;
goto err_detach;
if (device_create_file(&tun->dev->dev, &dev_attr_tun_flags) ||
device_create_file(&tun->dev->dev, &dev_attr_owner) ||
@ -1689,7 +1689,12 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
strcpy(ifr->ifr_name, tun->dev->name);
return 0;
err_free_dev:
err_detach:
tun_detach_all(dev);
err_free_flow:
tun_flow_uninit(tun);
security_tun_dev_free_security(tun->security);
err_free_dev:
free_netdev(dev);
return err;
}