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>

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 794a96f6b8d9668bd53025f637f3a0fc2f03a1a8..fe5cda0deb395db1d6a619e2145c22945ea05d74 100644 (file)
--- 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.