From f8ac36c85fc01821f27beff6340335b3fbc78d20 Mon Sep 17 00:00:00 2001
From: Thomas Graf <tgraf@suug.ch>
Date: Thu, 27 Nov 2014 00:22:33 +0100
Subject: [PATCH] bond: Check length of IFLA_BOND_ARP_IP_TARGET attributes

Fixes: cd77f0a1 ("bonding: add arp_ip_target netlink support")
Reported-by: John Fastabend <john.fastabend@gmail.com>
Cc: Scott Feldman <sfeldma@cumulusnetworks.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
 drivers/net/bonding/bond_netlink.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index c13d83e15ace4..45f09a66e6c96 100644
--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -225,7 +225,12 @@ static int bond_changelink(struct net_device *bond_dev,
 
 		bond_option_arp_ip_targets_clear(bond);
 		nla_for_each_nested(attr, data[IFLA_BOND_ARP_IP_TARGET], rem) {
-			__be32 target = nla_get_be32(attr);
+			__be32 target;
+
+			if (nla_len(attr) < sizeof(target))
+				return -EINVAL;
+
+			target = nla_get_be32(attr);
 
 			bond_opt_initval(&newval, (__force u64)target);
 			err = __bond_opt_set(bond, BOND_OPT_ARP_TARGETS,
-- 
2.39.5