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Commit eb0fb363 authored by Jason Wang's avatar Jason Wang Committed by David S. Miller

tuntap: attach queue 0 before registering netdevice

We attach queue 0 after registering netdevice currently. This leads to call
netif_set_real_num_{tx|rx}_queues() after registering the netdevice. Since we
allow tun/tap has a maximum of 1024 queues, this may lead a huge number of
uevents to be injected to userspace since we create 2048 kobjects and then
remove 2046. Solve this problem by attaching queue 0 and set the real number of
queues before registering netdevice.
Reported-by: default avatarJiri Slaby <>
Tested-by: default avatarJiri Slaby <>
Signed-off-by: default avatarJason Wang <>
Signed-off-by: default avatarDavid S. Miller <>
parent 092a5fc9
......@@ -493,9 +493,6 @@ static int tun_attach(struct tun_struct *tun, struct file *file)
if (tun->numqueues == 1)
/* device is allowed to go away first, so no need to hold extra
* refcnt.
......@@ -1612,6 +1609,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
dev->features = dev->hw_features;
err = tun_attach(tun, file);
if (err < 0)
goto err_free_dev;
err = register_netdevice(tun->dev);
if (err < 0)
goto err_free_dev;
......@@ -1621,9 +1622,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
device_create_file(&tun->dev->dev, &dev_attr_group))
pr_err("Failed to create tun sysfs files\n");
err = tun_attach(tun, file);
if (err < 0)
goto err_free_dev;
tun_debug(KERN_INFO, tun, "tun_set_iff\n");
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