releases/3.0.46/xfrm_user-return-error-pointer-instead-of-null-2.patch

From eba2ba4a166058cdf0ff8e19780e8274a9faf2cf Mon Sep 17 00:00:00 2001
From: Mathias Krause <minipli@googlemail.com>
Date: Fri, 14 Sep 2012 09:58:32 +0000
Subject: xfrm_user: return error pointer instead of NULL #2


From: Mathias Krause <minipli@googlemail.com>

[ Upstream commit c25463722509fef0ed630b271576a8c9a70236f3 ]

When dump_one_policy() returns an error, e.g. because of a too small
buffer to dump the whole xfrm policy, xfrm_policy_netlink() returns
NULL instead of an error pointer. But its caller expects an error
pointer and therefore continues to operate on a NULL skbuff.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Acked-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/xfrm/xfrm_user.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -1531,6 +1531,7 @@ static struct sk_buff *xfrm_policy_netli
 {
 	struct xfrm_dump_info info;
 	struct sk_buff *skb;
+	int err;
 
 	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
 	if (!skb)
@@ -1541,9 +1542,10 @@ static struct sk_buff *xfrm_policy_netli
 	info.nlmsg_seq = seq;
 	info.nlmsg_flags = 0;
 
-	if (dump_one_policy(xp, dir, 0, &info) < 0) {
+	err = dump_one_policy(xp, dir, 0, &info);
+	if (err) {
 		kfree_skb(skb);
-		return NULL;
+		return ERR_PTR(err);
 	}
 
 	return skb;