vlan: fix a race in egress prio management
Eric Dumazet [Thu, 18 Jul 2013 16:35:10 +0000 (09:35 -0700)]
[ Upstream commit 3e3aac497513c669e1c62c71e1d552ea85c1d974 ]

egress_priority_map[] hash table updates are protected by rtnl,
and we never remove elements until device is dismantled.

We have to make sure that before inserting an new element in hash table,
all its fields are committed to memory or else another cpu could
find corrupt values and crash.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

net/8021q/vlan_dev.c

index 3a8c8fd..1cd3d2a 100644 (file)
@@ -73,6 +73,8 @@ vlan_dev_get_egress_qos_mask(struct net_device *dev, struct sk_buff *skb)
 {
        struct vlan_priority_tci_mapping *mp;
 
+       smp_rmb(); /* coupled with smp_wmb() in vlan_dev_set_egress_priority() */
+
        mp = vlan_dev_priv(dev)->egress_priority_map[(skb->priority & 0xF)];
        while (mp) {
                if (mp->priority == skb->priority) {
@@ -249,6 +251,11 @@ int vlan_dev_set_egress_priority(const struct net_device *dev,
        np->next = mp;
        np->priority = skb_prio;
        np->vlan_qos = vlan_qos;
+       /* Before inserting this element in hash table, make sure all its fields
+        * are committed to memory.
+        * coupled with smp_rmb() in vlan_dev_get_egress_qos_mask()
+        */
+       smp_wmb();
        vlan->egress_priority_map[skb_prio & 0xF] = np;
        if (vlan_qos)
                vlan->nr_egress_mappings++;