openvswitch: Add skb_clone NULL check for the sampling action.

Fix a bug where skb_clone() NULL check is missing in sample action
implementation.

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

1 files changed, 2 insertions, 0 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 794a96f6b8d9..fe5cda0deb39 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -477,6 +477,8 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
                 skb_get(skb);
         } else {
                 sample_skb = skb_clone(skb, GFP_ATOMIC);
+                if (!sample_skb) /* Skip sample action when out of memory. */
+                        return 0;
         }
 
         /* Note that do_execute_actions() never consumes skb.