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veth: Enforce minimum size of VETH_INFO_PEER 

VETH_INFO_PEER carries struct ifinfomsg plus optional IFLA
attributes. A minimal size of sizeof(struct ifinfomsg) must be
enforced or we may risk accessing that struct beyond the limits
of the netlink message.

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf 2012-02-15 04:09:46 +00:00 committed by David S. Miller
parent 78a5249fc9
commit 237114384a
1 changed files with 3 additions and 1 deletions
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4
drivers/net/veth.c
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@ -422,7 +422,9 @@ static void veth_dellink(struct net_device *dev, struct list_head *head)
unregister_netdevice_queue(peer, head);
}
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1];
static const struct nla_policy veth_policy[VETH_INFO_MAX + 1] = {
[VETH_INFO_PEER] = { .len = sizeof(struct ifinfomsg) },
};
static struct rtnl_link_ops veth_link_ops = {
.kind = DRV_NAME,