From: Dan Carpenter <dan.carpenter@oracle.com>
Date: Mon, 23 Jul 2012 07:46:28 +0000 (+0300)
Subject: openvswitch: potential NULL deref in sample()
X-Git-Tag: firefly_0821_release~3680^2~2381^2~11
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5b3e7e6cb5771bedda51cdb6f715d1da8cd9e644;p=firefly-linux-kernel-4.4.55.git

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>
---

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);
 }