From: Thomas Graf <tgraf@suug.ch>
Date: Wed, 26 Nov 2014 23:22:33 +0000 (+0100)
Subject: bond: Check length of IFLA_BOND_ARP_IP_TARGET attributes
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=f6c6fda4c9e17940b0a2ba206b0408babfdc930c;p=deliverable%2Flinux.git

bond: Check length of IFLA_BOND_ARP_IP_TARGET attributes

Fixes: 7f28fa10 ("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>
---

diff --git a/drivers/net/bonding/bond_netlink.c b/drivers/net/bonding/bond_netlink.c
index c13d83e15ace..45f09a66e6c9 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,