netdev - [patch] openvswitch: potential NULL deref in sample()

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Date:	Mon, 23 Jul 2012 10:46:28 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jesse Gross <jesse@...ira.com>
Cc:	"David S. Miller" <davem@...emloft.net>, dev@...nvswitch.org,
	netdev@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] 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@...cle.com>
---
This applies to Linus's tree.

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 48badff..c2351d6 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);
 }
--
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