netdev - [PATCH net-next 1/4] netlink: fix test alignment in nla_align

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Message-Id: <1461142655-5067-2-git-send-email-nicolas.dichtel@6wind.com>
Date:	Wed, 20 Apr 2016 10:57:32 +0200
From:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:	netdev@...r.kernel.org
Cc:	davem@...emloft.net, roopa@...ulusnetworks.com,
	eric.dumazet@...il.com, tgraf@...g.ch, jhs@...atatu.com,
	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Subject: [PATCH net-next 1/4] netlink: fix test alignment in nla_align_64bit()

IS_ALIGN() returns true when the alignment is as expected. The pad
attribute should be added only when the alignment is not 8.

Fixes: 35c5845957c7 ("net: Add helpers for 64-bit aligning netlink attributes.")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 include/net/netlink.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/netlink.h b/include/net/netlink.h
index e644b3489acf..694caac31d2c 100644
--- a/include/net/netlink.h
+++ b/include/net/netlink.h
@@ -1245,7 +1245,7 @@ static inline int nla_validate_nested(const struct nlattr *start, int maxtype,
 static inline int nla_align_64bit(struct sk_buff *skb, int padattr)
 {
 #ifndef HAVE_EFFICIENT_UNALIGNED_ACCESS
-	if (IS_ALIGNED((unsigned long)skb->data, 8)) {
+	if (!IS_ALIGNED((unsigned long)skb->data, 8)) {
 		struct nlattr *attr = nla_reserve(skb, padattr, 0);
 		if (!attr)
 			return -EMSGSIZE;
-- 
2.4.2