linux-kernel - [ 126/150] xfrm: release neighbor upon dst destruction

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Date:	Tue, 26 Feb 2013 15:56:23 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Romain Kuntz <r.kuntz@...lavors.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 126/150] xfrm: release neighbor upon dst destruction

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

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


From: Romain KUNTZ <r.kuntz@...lavors.com>

[ Upstream commit 18cf0d0784b4a634472ed24d0d7ca1c721d93e90 ]

Neighbor is cloned in xfrm6_fill_dst but seems to never be released.
Neighbor entry should be released when XFRM6 dst entry is destroyed
in xfrm6_dst_destroy, otherwise references may be kept forever on
the device pointed by the neighbor entry.

I may not have understood all the subtleties of XFRM & dst so I would
be happy to receive comments on this patch.

Signed-off-by: Romain Kuntz <r.kuntz@...lavors.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/ipv6/xfrm6_policy.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -236,6 +236,8 @@ static void xfrm6_dst_destroy(struct dst
 {
 	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
 
+	if (likely(xdst->u.rt6.n))
+		neigh_release(xdst->u.rt6.n);
 	if (likely(xdst->u.rt6.rt6i_idev))
 		in6_dev_put(xdst->u.rt6.rt6i_idev);
 	dst_destroy_metrics_generic(dst);


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