From 662ca437e714caaab855b12415d6ffd815985bc0 Mon Sep 17 00:00:00 2001 From: Jason Wang <jasowang@redhat.com> Date: Wed, 11 Sep 2013 18:09:48 +0800 Subject: [PATCH] tuntap: correctly handle error in tun_set_iff() Commit c8d68e6be1c3b242f1c598595830890b65cea64a (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> --- drivers/net/tun.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/drivers/net/tun.c b/drivers/net/tun.c index a639de8401f87..807815fc99683 100644 --- a/drivers/net/tun.c +++ b/drivers/net/tun.c @@ -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; } -- 2.30.2