rtnl: fix info leak on RTM_GETLINK request for VF devices

Initialize the mac address buffer with 0 as the driver specific function
will probably not fill the whole buffer. In fact, all in-kernel drivers
fill only ETH_ALEN of the MAX_ADDR_LEN bytes, i.e. 6 of the 32 possible
bytes. Therefore we currently leak 26 bytes of stack memory to userland
via the netlink interface.

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 0 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index b376410ff259..a585d45cc9d9 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -979,6 +979,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
                          * report anything.
                          */
                         ivi.spoofchk = -1;
+                        memset(ivi.mac, 0, sizeof(ivi.mac));
                         if (dev->netdev_ops->ndo_get_vf_config(dev, i, &ivi))
                                 break;
                         vf_mac.vf =