linux-kernel - [PATCH] [XFRM]: Don't dereference error pointer dst1

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Message-ID: <4CA3BFA3.1060204@gmail.com>
Date:	Thu, 30 Sep 2010 00:37:23 +0200
From:	Roel Kluin <roel.kluin@...il.com>
To:	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] [XFRM]: Don't dereference error pointer dst1

Don't dereference dst1 when it's an error pointer.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
 net/xfrm/xfrm_policy.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

I just noticed this by code analysis. It wasn't tested in any way.

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index cbab6e1..b186c3d 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1414,13 +1414,14 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 
 	for (; i < nx; i++) {
 		struct xfrm_dst *xdst = xfrm_alloc_dst(net, family);
-		struct dst_entry *dst1 = &xdst->u.dst;
+		struct dst_entry *dst1;
 
 		err = PTR_ERR(xdst);
 		if (IS_ERR(xdst)) {
 			dst_release(dst);
 			goto put_states;
 		}
+		dst1 = &xdst->u.dst;
 
 		if (!dst_prev)
 			dst0 = dst1;

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