netdev - [PATCH net-next 8/9] net: openvswitch: fix possible memleak on destroy flow table

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Message-Id: <1569777006-7435-9-git-send-email-xiangxia.m.yue@gmail.com>
Date:   Mon, 30 Sep 2019 01:10:05 +0800
From:   xiangxia.m.yue@...il.com
To:     gvrose8192@...il.com, pshelar@....org
Cc:     netdev@...r.kernel.org, Tonghao Zhang <xiangxia.m.yue@...il.com>
Subject: [PATCH net-next 8/9] net: openvswitch: fix possible memleak on destroy flow table

From: Tonghao Zhang <xiangxia.m.yue@...il.com>

When we destroy the flow tables which may contain the flow_mask,
so release the flow mask struct.

Signed-off-by: Tonghao Zhang <xiangxia.m.yue@...il.com>
---
 net/openvswitch/flow_table.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index c21fd52..a2e0cb1 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -218,6 +218,18 @@ static int tbl_mask_array_realloc(struct flow_table *tbl, int size)
        return 0;
 }
 
+static void tbl_mask_array_destroy(struct flow_table *tbl)
+{
+	struct mask_array *ma = ovsl_dereference(tbl->mask_array);
+	int i;
+
+	/* Free the flow-mask and kfree_rcu the NULL is allowed. */
+	for (i = 0; i < ma->count; i++)
+		kfree_rcu(ma->masks[i], rcu);
+
+	kfree_rcu(tbl->mask_array, rcu);
+}
+
 int ovs_flow_tbl_init(struct flow_table *table)
 {
 	struct table_instance *ti, *ufid_ti;
@@ -312,7 +324,7 @@ void ovs_flow_tbl_destroy(struct flow_table *table)
 	struct table_instance *ufid_ti = rcu_dereference_raw(table->ufid_ti);
 
 	free_percpu(table->mask_cache);
-	kfree(rcu_dereference_raw(table->mask_array));
+	tbl_mask_array_destroy(table);
 	table_instance_destroy(ti, ufid_ti, false);
 }
 
-- 
1.8.3.1