[RTNETLINK]: Fix IFLA_ADDRESS handling.

The ->set_mac_address handlers expect a pointer to a
sockaddr which contains the MAC address, whereas
IFLA_ADDRESS provides just the MAC address itself.

So whip up a sockaddr to wrap around the netlink
attribute for the ->set_mac_address call.

Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 20e5bb7..30cc1ba 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -394,6 +394,9 @@ static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
        }
 
        if (ida[IFLA_ADDRESS - 1]) {
+               struct sockaddr *sa;
+               int len;
+
                if (!dev->set_mac_address) {
                        err = -EOPNOTSUPP;
                        goto out;
@@ -405,7 +408,17 @@ static int do_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
                if (ida[IFLA_ADDRESS - 1]->rta_len != RTA_LENGTH(dev->addr_len))
                        goto out;
 
-               err = dev->set_mac_address(dev, RTA_DATA(ida[IFLA_ADDRESS - 1]));
+               len = sizeof(sa_family_t) + dev->addr_len;
+               sa = kmalloc(len, GFP_KERNEL);
+               if (!sa) {
+                       err = -ENOMEM;
+                       goto out;
+               }
+               sa->sa_family = dev->type;
+               memcpy(sa->sa_data, RTA_DATA(ida[IFLA_ADDRESS - 1]),
+                      dev->addr_len);
+               err = dev->set_mac_address(dev, sa);
+               kfree(sa);
                if (err)
                        goto out;
                send_addr_notify = 1;