netdev - [PATCH v2] openvswitch: allocate nr_node_ids flow_stats instead of num_possible

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Message-Id: <1437500193-10255-1-git-send-email-chris.j.arges@canonical.com>
Date:	Tue, 21 Jul 2015 12:36:33 -0500
From:	Chris J Arges <chris.j.arges@...onical.com>
To:	nacc@...ux.vnet.ibm.com, pshelar@...ira.com
Cc:	linuxppc-dev@...ts.ozlabs.org, benh@...nel.crashing.org,
	linux-numa@...r.kernel.org, davem@...emloft.net,
	netdev@...r.kernel.org, dev@...nvswitch.org,
	linux-kernel@...r.kernel.org,
	Chris J Arges <chris.j.arges@...onical.com>
Subject: [PATCH v2] openvswitch: allocate nr_node_ids flow_stats instead of num_possible_nodes

Some architectures like POWER can have a NUMA node_possible_map that
contains sparse entries. This causes memory corruption with openvswitch
since it allocates flow_cache with a multiple of num_possible_nodes() and
assumes the node variable returned by for_each_node will index into
flow->stats[node].

Use nr_node_ids to allocate a maximal sparse array instead of
num_possible_nodes().

The crash was noticed after 3af229f2 was applied as it changed the
node_possible_map to match node_online_map on boot.
Fixes: 3af229f2071f5b5cb31664be6109561fbe19c861

Signed-off-by: Chris J Arges <chris.j.arges@...onical.com>
---
 net/openvswitch/flow_table.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 4613df8..6552394 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -752,7 +752,7 @@ int ovs_flow_init(void)
 	BUILD_BUG_ON(sizeof(struct sw_flow_key) % sizeof(long));
 
 	flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow)
-				       + (num_possible_nodes()
+				       + (nr_node_ids
 					  * sizeof(struct flow_stats *)),
 				       0, 0, NULL);
 	if (flow_cache == NULL)
-- 
1.9.1

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