linux-kernel - [PATCH 4.4 240/312] bonding: fix length of actor system

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Message-Id: <20200508123141.304323372@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:33:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tobias Jungel <tobias.jungel@...il.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.4 240/312] bonding: fix length of actor system

From: Tobias Jungel <tobias.jungel@...il.com>

commit 414dd6fb9a1a1b59983aea7bf0f79f0085ecc5b8 upstream.

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>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

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

--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -628,8 +628,7 @@ static int bond_fill_info(struct sk_buff
 				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)) {