[PATCH 3.17 34/47] bond: Check length of IFLA_BOND_ARP_IP_TARGET attributes

[Greg Kroah-Hartman]

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Thomas Graf <tgraf@xxxxxxx>

[ Upstream commit f6c6fda4c9e17940b0a2ba206b0408babfdc930c ]

Fixes: 7f28fa10 ("bonding: add arp_ip_target netlink support")
Reported-by: John Fastabend <john.fastabend@xxxxxxxxx>
Cc: Scott Feldman <sfeldma@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Graf <tgraf@xxxxxxx>
Acked-by: John Fastabend <john.r.fastabend@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/bonding/bond_netlink.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/net/bonding/bond_netlink.c
+++ b/drivers/net/bonding/bond_netlink.c
@@ -194,7 +194,12 @@ static int bond_changelink(struct net_de
 
 		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,


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