[ovs-dev,net-next,v3,08/10] net: openvswitch: fix possible memleak on destroy flow-table
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Message ID 1570802447-8019-9-git-send-email-xiangxia.m.yue@gmail.com
State New
Headers show
Series
  • optimize openvswitch flow looking up
Related show

Commit Message

Tonghao Zhang Oct. 11, 2019, 2 p.m. UTC
From: Tonghao Zhang <xiangxia.m.yue@gmail.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@gmail.com>
---
 net/openvswitch/flow_table.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

Patch
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diff --git a/net/openvswitch/flow_table.c b/net/openvswitch/flow_table.c
index 1fc6be2..0317f1c 100644
--- a/net/openvswitch/flow_table.c
+++ b/net/openvswitch/flow_table.c
@@ -293,6 +293,18 @@  static void table_instance_destroy(struct table_instance *ti,
 	}
 }
 
+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);
+}
+
 /* No need for locking this function is called from RCU callback or
  * error path.
  */
@@ -302,7 +314,7 @@  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(table->mask_array, rcu);
+	tbl_mask_array_destroy(table);
 	table_instance_destroy(ti, ufid_ti, false);
 }