netdev - [PATCH net 1/4] openvswitch: Fix a double free bug for the sample action

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Message-Id: <1404196464-5129-1-git-send-email-pshelar@nicira.com>
Date:	Mon, 30 Jun 2014 23:34:24 -0700
From:	Pravin B Shelar <pshelar@...ira.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, Andy Zhou <azhou@...ira.com>,
	Pravin B Shelar <pshelar@...ira.com>
Subject: [PATCH net 1/4] openvswitch: Fix a double free bug for the sample action

From: Andy Zhou <azhou@...ira.com>

When sample action returns with an error, the skb has already been
freed. This patch fix a bug to make sure we don't free it again.
This bug introduced by commit ccb1352e76cff05 (net: Add Open vSwitch
kernel components.)

Signed-off-by: Andy Zhou <azhou@...ira.com>
Signed-off-by: Pravin B Shelar <pshelar@...ira.com>
---
 net/openvswitch/actions.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index c36856a..e70d8b1 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -551,6 +551,8 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 
 		case OVS_ACTION_ATTR_SAMPLE:
 			err = sample(dp, skb, a);
+			if (unlikely(err)) /* skb already freed. */
+				return err;
 			break;
 		}
 
-- 
1.9.3

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