openvswitch: Fix a double free bug for the sample action

When sample action returns with an error, the skb has already been
freed. This patch fix a bug to make sure we don't free it again.
This bug introduced by commit a4f3d0bcc179e79 (net: Add Open vSwitch
kernel components.)

Signed-off-by: Andy Zhou <azhou@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index c36856a457ca963c735e89e36478a53ba60bb453..e70d8b18e96290af1435ef8423c9d71e5496df2d 100644 (file)
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -551,6 +551,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 
                case OVS_ACTION_ATTR_SAMPLE:
                        err = sample(dp, skb, a);
+                       if (unlikely(err)) /* skb already freed. */
+                               return err;
                        break;
                }