netdev - [PATCH] xfrm: fix potential incorrect pointer dereference in xfrm_bundle

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Message-ID: <1390675673-20682-1-git-send-email-horia.geanta@freescale.com>
Date:	Sat, 25 Jan 2014 20:47:53 +0200
From:	Horia Geanta <horia.geanta@...escale.com>
To:	Steffen Klassert <steffen.klassert@...unet.com>
CC:	<netdev@...r.kernel.org>
Subject: [PATCH] xfrm: fix potential incorrect pointer dereference in xfrm_bundle_create

Return value of xfrm_alloc_dst might be an error code.
Need to check this before using the pointer safely.

Signed-off-by: Horia Geanta <horia.geanta@...escale.com>
---
 net/xfrm/xfrm_policy.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 9a91f74..f230f2a 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -1541,7 +1541,7 @@ 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)) {
@@ -1560,6 +1560,8 @@ static struct dst_entry *xfrm_bundle_create(struct xfrm_policy *policy,
 		} else
 			inner_mode = xfrm[i]->inner_mode;
 
+		dst1 = &xdst->u.dst;
+
 		if (!dst_prev)
 			dst0 = dst1;
 		else {
-- 
1.8.3.1


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