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>
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