From 6b863d1d3239eff0f45c2e6e672f5b56db828db0 Mon Sep 17 00:00:00 2001
From: Eric Dumazet <eric.dumazet@gmail.com>
Date: Tue, 17 Nov 2009 06:45:04 -0800
Subject: 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>
---
 net/8021q/vlan.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'net/8021q')

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 @@ out_uninit_applicant:
 	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;
 }
 
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