datapath: 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>
Acked-by: Pravin B Shelar <pshelar@nicira.com>

diff --git a/datapath/actions.c b/datapath/actions.c
index caf432e..5c0e2b7 100644 (file)
--- a/datapath/actions.c
+++ b/datapath/actions.c
@@ -576,6 +576,9 @@ 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 the sample action when out of memory. */
+                       return 0;
        }
 
        /* Note that do_execute_actions() never consumes skb.