netdev - [PATCH ipsec] xfrm: properly handle invalid states as an error

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Message-Id: <1369222847-8542-1-git-send-email-timo.teras@iki.fi>
Date:	Wed, 22 May 2013 14:40:47 +0300
From:	Timo Teräs <timo.teras@....fi>
To:	netdev@...r.kernel.org
Cc:	Timo Teräs <timo.teras@....fi>,
	Li RongQing <roy.qing.li@...il.com>,
	Steffen Klassert <steffen.klassert@...unet.com>
Subject: [PATCH ipsec] xfrm: properly handle invalid states as an error

The error exit path needs err explicitly set. Otherwise it
returns success and the only caller, xfrm_output_resume(),
would oops in skb_dst(skb)->ops derefence as skb_dst(skb) is
NULL.

Bug introduced in commit bb65a9cb (xfrm: removes a superfluous
check and add a statistic).

Signed-off-by: Timo Teräs <timo.teras@....fi>
Cc: Li RongQing <roy.qing.li@...il.com>
Cc: Steffen Klassert <steffen.klassert@...unet.com>
---
Should go also to 3.9-stable.

 net/xfrm/xfrm_output.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/xfrm/xfrm_output.c b/net/xfrm/xfrm_output.c
index bcfda89..0cf003d 100644
--- a/net/xfrm/xfrm_output.c
+++ b/net/xfrm/xfrm_output.c
@@ -64,6 +64,7 @@ static int xfrm_output_one(struct sk_buff *skb, int err)
 
 		if (unlikely(x->km.state != XFRM_STATE_VALID)) {
 			XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEINVALID);
+			err = -EINVAL;
 			goto error;
 		}
 
-- 
1.8.2.3

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