openvswitch: potential NULL deref in sample()

If there is no OVS_SAMPLE_ATTR_ACTIONS set then "acts_list" is NULL and
it leads to a NULL dereference when we call nla_len(acts_list).  This
is a static checker fix, not something I have seen in testing.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index f3f96badf5aa..320fa0e6951a 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -325,6 +325,9 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
                 }
         }
 
+        if (!acts_list)
+                return 0;
+
         return do_execute_actions(dp, skb, nla_data(acts_list),
                                                  nla_len(acts_list), true);
 }