The "vf_vlan_info" struct ends with a 2 byte struct hole so we have to
memset it to ensure that no stack information is revealed to user space.

Fixes: 79aab093a0b5 ('net: Update API for VF vlan protocol 802.1ad support')
Signed-off-by: Dan Carpenter <>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index b06d2f4..fb7348f 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1144,6 +1144,8 @@ static noinline_for_stack int rtnl_fill_vfinfo(struct 
sk_buff *skb,
        if (dev->netdev_ops->ndo_get_vf_config(dev, vfs_num, &ivi))
                return 0;
+       memset(&vf_vlan_info, 0, sizeof(vf_vlan_info));
        vf_mac.vf =
                vf_vlan.vf =
                vf_vlan_info.vf =

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