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tuntap: forbid changing mq flag for persistent device

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We currently allow changing the mq flag (IFF_MULTI_QUEUE) for a persistent
device. This will result a mismatch between the number the queues in netdev and
tuntap. This is because we only allocate a 1q netdevice when IFF_MULTI_QUEUE was
not specified, so when we set the IFF_MULTI_QUEUE and try to attach more queues
later, netif_set_real_num_tx_queues() may fail which result a single queue
netdevice with multiple sockets attached.

Solve this by disallowing changing the mq flag for persistent device.

Bug was introduced by commit edfb6a148c
(tuntap: reduce memory using of queues).

Reported-by: Sriram Narasimhan <sriram.narasimhan@hp.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jason Wang 2013-05-28 18:32:11 +00:00 committed by David S. Miller
parent 456db6a4d4
commit 8e6d91ae09
1 changed files with 4 additions and 0 deletions
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4
drivers/net/tun.c
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@ -1585,6 +1585,10 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
else
return -EINVAL;
if (!!(ifr->ifr_flags & IFF_MULTI_QUEUE) !=
!!(tun->flags & TUN_TAP_MQ))
return -EINVAL;
if (tun_not_capable(tun))
return -EPERM;
err = security_tun_dev_open(tun->security);