linux-kernel - [PATCH 3.16.y-ckt 27/71] xfrm: fix a race in xfrm_state_lookup

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Message-Id: <1435226570-3669-28-git-send-email-luis.henriques@canonical.com>
Date:	Thu, 25 Jun 2015 11:02:06 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Fan Du <fan.du@...el.com>, Li RongQing <roy.qing.li@...il.com>,
	Steffen Klassert <steffen.klassert@...unet.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 27/71] xfrm: fix a race in xfrm_state_lookup_byspi

3.16.7-ckt14 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li RongQing <roy.qing.li@...il.com>

commit bdddbf6996c0b9299efc97b8f66e06286f3aa8c9 upstream.

The returned xfrm_state should be hold before unlock xfrm_state_lock,
otherwise the returned xfrm_state maybe be released.

Fixes: c454997e6[{pktgen, xfrm} Introduce xfrm_state_lookup_byspi..]
Cc: Fan Du <fan.du@...el.com>
Signed-off-by: Li RongQing <roy.qing.li@...il.com>
Acked-by: Fan Du <fan.du@...el.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 net/xfrm/xfrm_state.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 0ab54134bb40..86f381b09d8d 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -934,8 +934,8 @@ struct xfrm_state *xfrm_state_lookup_byspi(struct net *net, __be32 spi,
 			x->id.spi != spi)
 			continue;
 
-		spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 		xfrm_state_hold(x);
+		spin_unlock_bh(&net->xfrm.xfrm_state_lock);
 		return x;
 	}
 	spin_unlock_bh(&net->xfrm.xfrm_state_lock);
--
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