netdev - [PATCH v2] bonding: fix length of actor system

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Date:   Sun, 28 Oct 2018 12:54:10 +0100
From:   Tobias Jungel <tobias.jungel@...il.com>
To:     Jay Vosburgh <jay.vosburgh@...onical.com>
Cc:     Veaceslav Falico <vfalico@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: [PATCH v2] bonding: fix length of actor system

The attribute IFLA_BOND_AD_ACTOR_SYSTEM is sent to user space having the
length of sizeof(bond->params.ad_actor_system) which is 8 byte. This
patch aligns the length to ETH_ALEN to have the same MAC address exposed
as using sysfs.

Fixes: f87fda00b6ed2 ("bonding: prevent out of bound accesses")

Signed-off-by: Tobias Jungel <tobias.jungel@...il.com>
---
Changes in v2:
- correct Fixes line

 drivers/net/bonding/bond_netlink.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index 9697977b80f0..6b9ad8673218 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -638,8 +638,7 @@ static int bond_fill_info(struct sk_buff *skb,
 				goto nla_put_failure;

 			if (nla_put(skb, IFLA_BOND_AD_ACTOR_SYSTEM,
-				    sizeof(bond->params.ad_actor_system),
-				    &bond->params.ad_actor_system))
+				    ETH_ALEN, &bond->params.ad_actor_system))
 				goto nla_put_failure;
 		}
 		if (!bond_3ad_get_active_agg_info(bond, &info)) {
--
2.17.2