vlan: Fix register_vlan_dev() error path
In case register_netdevice() returns an error, and a new vlan_group
was allocated and inserted in vlan_group_hash[] we call
vlan_group_free() without deleting group from hash table. Future
lookups can give infinite loops or crashes.
We must delete the vlan_group using RCU safe procedure.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/8021q/vlan.c b/net/8021q/vlan.c
index 8836575..a29c5ab 100644
--- a/net/8021q/vlan.c
+++ b/net/8021q/vlan.c
@@ -281,8 +281,11 @@
if (ngrp)
vlan_gvrp_uninit_applicant(real_dev);
out_free_group:
- if (ngrp)
- vlan_group_free(ngrp);
+ if (ngrp) {
+ hlist_del_rcu(&ngrp->hlist);
+ /* Free the group, after all cpu's are done. */
+ call_rcu(&ngrp->rcu, vlan_rcu_free);
+ }
return err;
}