diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index 51e0c241..97208555 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -8,38 +8,38 @@
 	"Deps": [
 		{
 			"ImportPath": "github.com/containernetworking/cni/libcni",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/invoke",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/skel",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/types",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/types/020",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/types/current",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/containernetworking/cni/pkg/version",
-			"Comment": "v0.5.2",
-			"Rev": "137b4975ecab6e1f0c24c1e3c228a50a3cfba75e"
+			"Comment": "v0.5.2-git49d814c",
+			"Rev": "49d814cf37bfea351a1caedd0c66825c9d6fca52"
 		},
 		{
 			"ImportPath": "github.com/coreos/go-iptables/iptables",
diff --git a/pkg/ipam/ipam.go b/pkg/ipam/ipam.go
index 54f80c0e..0685679d 100644
--- a/pkg/ipam/ipam.go
+++ b/pkg/ipam/ipam.go
@@ -53,7 +53,11 @@ func ConfigureIface(ifName string, res *current.Result) error {
 
 	var v4gw, v6gw net.IP
 	for _, ipc := range res.IPs {
-		if int(ipc.Interface) >= len(res.Interfaces) || res.Interfaces[ipc.Interface].Name != ifName {
+		if ipc.Interface == nil {
+			continue
+		}
+		intIdx := *ipc.Interface
+		if intIdx < 0 || intIdx >= len(res.Interfaces) || res.Interfaces[intIdx].Name != ifName {
 			// IP address is for a different interface
 			return fmt.Errorf("failed to add IP addr %v to %q: invalid interface index", ipc, ifName)
 		}
diff --git a/pkg/ipam/ipam_test.go b/pkg/ipam/ipam_test.go
index 844867f2..cf851175 100644
--- a/pkg/ipam/ipam_test.go
+++ b/pkg/ipam/ipam_test.go
@@ -109,13 +109,13 @@ var _ = Describe("IPAM Operations", func() {
 			IPs: []*current.IPConfig{
 				{
 					Version:   "4",
-					Interface: 0,
+					Interface: current.Int(0),
 					Address:   *ipv4,
 					Gateway:   ipgw4,
 				},
 				{
 					Version:   "6",
-					Interface: 0,
+					Interface: current.Int(0),
 					Address:   *ipv6,
 					Gateway:   ipgw6,
 				},
@@ -226,7 +226,7 @@ var _ = Describe("IPAM Operations", func() {
 	})
 
 	It("returns an error when the interface index doesn't match the link name", func() {
-		result.IPs[0].Interface = 1
+		result.IPs[0].Interface = current.Int(1)
 		err := originalNS.Do(func(ns.NetNS) error {
 			return ConfigureIface(LINK_NAME, result)
 		})
@@ -234,7 +234,15 @@ var _ = Describe("IPAM Operations", func() {
 	})
 
 	It("returns an error when the interface index is too big", func() {
-		result.IPs[0].Interface = 2
+		result.IPs[0].Interface = current.Int(2)
+		err := originalNS.Do(func(ns.NetNS) error {
+			return ConfigureIface(LINK_NAME, result)
+		})
+		Expect(err).To(HaveOccurred())
+	})
+
+	It("returns an error when the interface index is too small", func() {
+		result.IPs[0].Interface = current.Int(-1)
 		err := originalNS.Do(func(ns.NetNS) error {
 			return ConfigureIface(LINK_NAME, result)
 		})
@@ -255,4 +263,37 @@ var _ = Describe("IPAM Operations", func() {
 		})
 		Expect(err).To(HaveOccurred())
 	})
+
+	It("does not panic when interface is not specified", func() {
+		result = &current.Result{
+			Interfaces: []*current.Interface{
+				{
+					Name:    "eth0",
+					Mac:     "00:11:22:33:44:55",
+					Sandbox: "/proc/3553/ns/net",
+				},
+				{
+					Name:    "fake0",
+					Mac:     "00:33:44:55:66:77",
+					Sandbox: "/proc/1234/ns/net",
+				},
+			},
+			IPs: []*current.IPConfig{
+				{
+					Version: "4",
+					Address: *ipv4,
+					Gateway: ipgw4,
+				},
+				{
+					Version: "6",
+					Address: *ipv6,
+					Gateway: ipgw6,
+				},
+			},
+		}
+		err := originalNS.Do(func(ns.NetNS) error {
+			return ConfigureIface(LINK_NAME, result)
+		})
+		Expect(err).NotTo(HaveOccurred())
+	})
 })
diff --git a/plugins/ipam/host-local/host_local_test.go b/plugins/ipam/host-local/host_local_test.go
index 68942ea1..30b73c81 100644
--- a/plugins/ipam/host-local/host_local_test.go
+++ b/plugins/ipam/host-local/host_local_test.go
@@ -86,27 +86,25 @@ var _ = Describe("host-local Operations", func() {
 		// Gomega is cranky about slices with different caps
 		Expect(*result.IPs[0]).To(Equal(
 			current.IPConfig{
-				Version:   "4",
-				Interface: 0,
-				Address:   mustCIDR("10.1.2.2/24"),
-				Gateway:   net.ParseIP("10.1.2.1"),
+				Version: "4",
+				Address: mustCIDR("10.1.2.2/24"),
+				Gateway: net.ParseIP("10.1.2.1"),
 			}))
 
 		Expect(*result.IPs[1]).To(Equal(
 			current.IPConfig{
-				Version:   "6",
-				Interface: 0,
-				Address:   mustCIDR("2001:db8:1::2/64"),
-				Gateway:   net.ParseIP("2001:db8:1::1"),
+				Version: "6",
+				Address: mustCIDR("2001:db8:1::2/64"),
+				Gateway: net.ParseIP("2001:db8:1::1"),
 			},
 		))
 		Expect(len(result.IPs)).To(Equal(2))
 
 		Expect(result.Routes).To(Equal([]*types.Route{
-			&types.Route{Dst: mustCIDR("0.0.0.0/0"), GW: nil},
-			&types.Route{Dst: mustCIDR("::/0"), GW: nil},
-			&types.Route{Dst: mustCIDR("192.168.0.0/16"), GW: net.ParseIP("1.1.1.1")},
-			&types.Route{Dst: mustCIDR("2001:db8:2::0/64"), GW: net.ParseIP("2001:db8:3::1")},
+			{Dst: mustCIDR("0.0.0.0/0"), GW: nil},
+			{Dst: mustCIDR("::/0"), GW: nil},
+			{Dst: mustCIDR("192.168.0.0/16"), GW: net.ParseIP("1.1.1.1")},
+			{Dst: mustCIDR("2001:db8:2::0/64"), GW: net.ParseIP("2001:db8:3::1")},
 		}))
 
 		ipFilePath1 := filepath.Join(tmpDir, "mynet", "10.1.2.2")
diff --git a/plugins/main/bridge/bridge.go b/plugins/main/bridge/bridge.go
index 797409e1..4e5bb1e4 100644
--- a/plugins/main/bridge/bridge.go
+++ b/plugins/main/bridge/bridge.go
@@ -100,7 +100,7 @@ func calcGateways(result *current.Result, n *NetConf) (*gwInfo, *gwInfo, error)
 		defaultNet.Mask = net.IPMask(defaultNet.IP)
 
 		// All IPs currently refer to the container interface
-		ipc.Interface = 2
+		ipc.Interface = current.Int(2)
 
 		// If not provided, calculate the gateway address corresponding
 		// to the selected IP address
diff --git a/plugins/main/ipvlan/ipvlan.go b/plugins/main/ipvlan/ipvlan.go
index b9c7b1b3..09924ef3 100644
--- a/plugins/main/ipvlan/ipvlan.go
+++ b/plugins/main/ipvlan/ipvlan.go
@@ -159,7 +159,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	for _, ipc := range result.IPs {
 		// All addresses belong to the ipvlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	result.Interfaces = []*current.Interface{ipvlanInterface}
diff --git a/plugins/main/macvlan/macvlan.go b/plugins/main/macvlan/macvlan.go
index 98e46a40..3b69194b 100644
--- a/plugins/main/macvlan/macvlan.go
+++ b/plugins/main/macvlan/macvlan.go
@@ -179,7 +179,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 
 	for _, ipc := range result.IPs {
 		// All addresses apply to the container macvlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	err = netns.Do(func(_ ns.NetNS) error {
diff --git a/plugins/main/ptp/ptp.go b/plugins/main/ptp/ptp.go
index 42b26707..12a77221 100644
--- a/plugins/main/ptp/ptp.go
+++ b/plugins/main/ptp/ptp.go
@@ -75,7 +75,7 @@ func setupContainerVeth(netns ns.NetNS, ifName string, mtu int, pr *current.Resu
 
 		for _, ipc := range pr.IPs {
 			// All addresses apply to the container veth interface
-			ipc.Interface = 1
+			ipc.Interface = current.Int(1)
 		}
 
 		pr.Interfaces = []*current.Interface{hostInterface, containerInterface}
diff --git a/plugins/main/vlan/vlan.go b/plugins/main/vlan/vlan.go
index b9aa4fee..7f527b55 100644
--- a/plugins/main/vlan/vlan.go
+++ b/plugins/main/vlan/vlan.go
@@ -148,7 +148,7 @@ func cmdAdd(args *skel.CmdArgs) error {
 	}
 	for _, ipc := range result.IPs {
 		// All addresses belong to the vlan interface
-		ipc.Interface = 0
+		ipc.Interface = current.Int(0)
 	}
 
 	result.Interfaces = []*current.Interface{vlanInterface}
diff --git a/plugins/meta/portmap/main.go b/plugins/meta/portmap/main.go
index c58db6aa..6424a777 100644
--- a/plugins/meta/portmap/main.go
+++ b/plugins/meta/portmap/main.go
@@ -164,9 +164,14 @@ func parseConfig(stdin []byte, ifName string) (*PortMapConf, error) {
 			}
 
 			// Skip known non-sandbox interfaces
-			intIdx := ip.Interface
-			if intIdx >= 0 && intIdx < len(conf.PrevResult.Interfaces) && conf.PrevResult.Interfaces[intIdx].Name != ifName {
-				continue
+			if ip.Interface != nil {
+				intIdx := *ip.Interface
+				if intIdx >= 0 &&
+					intIdx < len(conf.PrevResult.Interfaces) &&
+					(conf.PrevResult.Interfaces[intIdx].Name != ifName ||
+						conf.PrevResult.Interfaces[intIdx].Sandbox == "") {
+					continue
+				}
 			}
 			switch ip.Version {
 			case "6":
diff --git a/plugins/meta/portmap/portmap_integ_test.go b/plugins/meta/portmap/portmap_integ_test.go
index bcdbcfd9..158b9057 100644
--- a/plugins/meta/portmap/portmap_integ_test.go
+++ b/plugins/meta/portmap/portmap_integ_test.go
@@ -134,7 +134,8 @@ var _ = Describe("portmap integration tests", func() {
 		var contIP net.IP
 
 		for _, ip := range result.IPs {
-			if result.Interfaces[ip.Interface].Sandbox == "" {
+			intfIndex := *ip.Interface
+			if result.Interfaces[intfIndex].Sandbox == "" {
 				continue
 			}
 			contIP = ip.Address.IP
diff --git a/plugins/meta/portmap/portmap_test.go b/plugins/meta/portmap/portmap_test.go
index e67907f8..cf5ed5fb 100644
--- a/plugins/meta/portmap/portmap_test.go
+++ b/plugins/meta/portmap/portmap_test.go
@@ -124,6 +124,34 @@ var _ = Describe("portmapping configuration", func() {
 			_, err := parseConfig(configBytes, "container")
 			Expect(err).To(MatchError("Invalid host port number: 0"))
 		})
+
+		It("Does not fail on missing prevResult interface index", func() {
+			configBytes := []byte(`{
+	"name": "test",
+	"type": "portmap",
+	"cniVersion": "0.3.1",
+	"runtimeConfig": {
+		"portMappings": [
+			{ "hostPort": 8080, "containerPort": 80, "protocol": "tcp"}
+		]
+	},
+	"conditionsV4": ["a", "b"],
+	"prevResult": {
+		"interfaces": [
+			{"name": "host"}
+		],
+		"ips": [
+			{
+				"version": "4",
+				"address": "10.0.0.1/24",
+				"gateway": "10.0.0.1"
+			}
+		]
+	}
+}`)
+			_, err := parseConfig(configBytes, "container")
+			Expect(err).NotTo(HaveOccurred())
+		})
 	})
 
 	Describe("Generating chains", func() {
diff --git a/plugins/sample/main.go b/plugins/sample/main.go
index e55953c9..1abdc165 100644
--- a/plugins/sample/main.go
+++ b/plugins/sample/main.go
@@ -106,7 +106,10 @@ func cmdAdd(args *skel.CmdArgs) error {
 		}
 	} else {
 		for _, ip := range conf.PrevResult.IPs {
-			intIdx := ip.Interface
+			if ip.Interface == nil {
+				continue
+			}
+			intIdx := *ip.Interface
 			// Every IP is indexed in to the interfaces array, with "-1" standing
 			// for an unknown interface (which we'll assume to be Container-side
 			// Skip all IPs we know belong to an interface with the wrong name.
diff --git a/vendor/github.com/containernetworking/cni/pkg/invoke/args.go b/vendor/github.com/containernetworking/cni/pkg/invoke/args.go
index ba9d0c3b..39b63972 100644
--- a/vendor/github.com/containernetworking/cni/pkg/invoke/args.go
+++ b/vendor/github.com/containernetworking/cni/pkg/invoke/args.go
@@ -57,13 +57,16 @@ func (args *Args) AsEnv() []string {
 		pluginArgsStr = stringify(args.PluginArgs)
 	}
 
-	env = append(env,
-		"CNI_COMMAND="+args.Command,
-		"CNI_CONTAINERID="+args.ContainerID,
-		"CNI_NETNS="+args.NetNS,
-		"CNI_ARGS="+pluginArgsStr,
-		"CNI_IFNAME="+args.IfName,
-		"CNI_PATH="+args.Path)
+	// Ensure that the custom values are first, so any value present in
+	// the process environment won't override them.
+	env = append([]string{
+		"CNI_COMMAND=" + args.Command,
+		"CNI_CONTAINERID=" + args.ContainerID,
+		"CNI_NETNS=" + args.NetNS,
+		"CNI_ARGS=" + pluginArgsStr,
+		"CNI_IFNAME=" + args.IfName,
+		"CNI_PATH=" + args.Path,
+	}, env...)
 	return env
 }
 
diff --git a/vendor/github.com/containernetworking/cni/pkg/invoke/raw_exec.go b/vendor/github.com/containernetworking/cni/pkg/invoke/raw_exec.go
index d1bd860d..93f1e75d 100644
--- a/vendor/github.com/containernetworking/cni/pkg/invoke/raw_exec.go
+++ b/vendor/github.com/containernetworking/cni/pkg/invoke/raw_exec.go
@@ -50,13 +50,9 @@ func pluginErr(err error, output []byte) error {
 	if _, ok := err.(*exec.ExitError); ok {
 		emsg := types.Error{}
 		if perr := json.Unmarshal(output, &emsg); perr != nil {
-			return fmt.Errorf("netplugin failed but error parsing its diagnostic message %q: %v", string(output), perr)
+			emsg.Msg = fmt.Sprintf("netplugin failed but error parsing its diagnostic message %q: %v", string(output), perr)
 		}
-		details := ""
-		if emsg.Details != "" {
-			details = fmt.Sprintf("; %v", emsg.Details)
-		}
-		return fmt.Errorf("%v%v", emsg.Msg, details)
+		return &emsg
 	}
 
 	return err
diff --git a/vendor/github.com/containernetworking/cni/pkg/types/020/types.go b/vendor/github.com/containernetworking/cni/pkg/types/020/types.go
index 666cfe93..2833aba7 100644
--- a/vendor/github.com/containernetworking/cni/pkg/types/020/types.go
+++ b/vendor/github.com/containernetworking/cni/pkg/types/020/types.go
@@ -23,9 +23,9 @@ import (
 	"github.com/containernetworking/cni/pkg/types"
 )
 
-const implementedSpecVersion string = "0.2.0"
+const ImplementedSpecVersion string = "0.2.0"
 
-var SupportedVersions = []string{"", "0.1.0", implementedSpecVersion}
+var SupportedVersions = []string{"", "0.1.0", ImplementedSpecVersion}
 
 // Compatibility types for CNI version 0.1.0 and 0.2.0
 
@@ -39,7 +39,7 @@ func NewResult(data []byte) (types.Result, error) {
 
 func GetResult(r types.Result) (*Result, error) {
 	// We expect version 0.1.0/0.2.0 results
-	result020, err := r.GetAsVersion(implementedSpecVersion)
+	result020, err := r.GetAsVersion(ImplementedSpecVersion)
 	if err != nil {
 		return nil, err
 	}
@@ -52,18 +52,20 @@ func GetResult(r types.Result) (*Result, error) {
 
 // Result is what gets returned from the plugin (via stdout) to the caller
 type Result struct {
-	IP4 *IPConfig `json:"ip4,omitempty"`
-	IP6 *IPConfig `json:"ip6,omitempty"`
-	DNS types.DNS `json:"dns,omitempty"`
+	CNIVersion string    `json:"cniVersion,omitempty"`
+	IP4        *IPConfig `json:"ip4,omitempty"`
+	IP6        *IPConfig `json:"ip6,omitempty"`
+	DNS        types.DNS `json:"dns,omitempty"`
 }
 
 func (r *Result) Version() string {
-	return implementedSpecVersion
+	return ImplementedSpecVersion
 }
 
 func (r *Result) GetAsVersion(version string) (types.Result, error) {
 	for _, supportedVersion := range SupportedVersions {
 		if version == supportedVersion {
+			r.CNIVersion = version
 			return r, nil
 		}
 	}
diff --git a/vendor/github.com/containernetworking/cni/pkg/types/current/types.go b/vendor/github.com/containernetworking/cni/pkg/types/current/types.go
index b89a5d3a..caac92ba 100644
--- a/vendor/github.com/containernetworking/cni/pkg/types/current/types.go
+++ b/vendor/github.com/containernetworking/cni/pkg/types/current/types.go
@@ -24,9 +24,9 @@ import (
 	"github.com/containernetworking/cni/pkg/types/020"
 )
 
-const implementedSpecVersion string = "0.3.1"
+const ImplementedSpecVersion string = "0.3.1"
 
-var SupportedVersions = []string{"0.3.0", implementedSpecVersion}
+var SupportedVersions = []string{"0.3.0", ImplementedSpecVersion}
 
 func NewResult(data []byte) (types.Result, error) {
 	result := &Result{}
@@ -37,7 +37,7 @@ func NewResult(data []byte) (types.Result, error) {
 }
 
 func GetResult(r types.Result) (*Result, error) {
-	resultCurrent, err := r.GetAsVersion(implementedSpecVersion)
+	resultCurrent, err := r.GetAsVersion(ImplementedSpecVersion)
 	if err != nil {
 		return nil, err
 	}
@@ -63,16 +63,16 @@ func convertFrom020(result types.Result) (*Result, error) {
 	}
 
 	newResult := &Result{
-		DNS:    oldResult.DNS,
-		Routes: []*types.Route{},
+		CNIVersion: ImplementedSpecVersion,
+		DNS:        oldResult.DNS,
+		Routes:     []*types.Route{},
 	}
 
 	if oldResult.IP4 != nil {
 		newResult.IPs = append(newResult.IPs, &IPConfig{
-			Version:   "4",
-			Interface: -1,
-			Address:   oldResult.IP4.IP,
-			Gateway:   oldResult.IP4.Gateway,
+			Version: "4",
+			Address: oldResult.IP4.IP,
+			Gateway: oldResult.IP4.Gateway,
 		})
 		for _, route := range oldResult.IP4.Routes {
 			gw := route.GW
@@ -88,10 +88,9 @@ func convertFrom020(result types.Result) (*Result, error) {
 
 	if oldResult.IP6 != nil {
 		newResult.IPs = append(newResult.IPs, &IPConfig{
-			Version:   "6",
-			Interface: -1,
-			Address:   oldResult.IP6.IP,
-			Gateway:   oldResult.IP6.Gateway,
+			Version: "6",
+			Address: oldResult.IP6.IP,
+			Gateway: oldResult.IP6.Gateway,
 		})
 		for _, route := range oldResult.IP6.Routes {
 			gw := route.GW
@@ -117,6 +116,7 @@ func convertFrom030(result types.Result) (*Result, error) {
 	if !ok {
 		return nil, fmt.Errorf("failed to convert result")
 	}
+	newResult.CNIVersion = ImplementedSpecVersion
 	return newResult, nil
 }
 
@@ -134,6 +134,7 @@ func NewResultFromResult(result types.Result) (*Result, error) {
 
 // Result is what gets returned from the plugin (via stdout) to the caller
 type Result struct {
+	CNIVersion string         `json:"cniVersion,omitempty"`
 	Interfaces []*Interface   `json:"interfaces,omitempty"`
 	IPs        []*IPConfig    `json:"ips,omitempty"`
 	Routes     []*types.Route `json:"routes,omitempty"`
@@ -143,7 +144,8 @@ type Result struct {
 // Convert to the older 0.2.0 CNI spec Result type
 func (r *Result) convertTo020() (*types020.Result, error) {
 	oldResult := &types020.Result{
-		DNS: r.DNS,
+		CNIVersion: types020.ImplementedSpecVersion,
+		DNS:        r.DNS,
 	}
 
 	for _, ip := range r.IPs {
@@ -189,12 +191,13 @@ func (r *Result) convertTo020() (*types020.Result, error) {
 }
 
 func (r *Result) Version() string {
-	return implementedSpecVersion
+	return ImplementedSpecVersion
 }
 
 func (r *Result) GetAsVersion(version string) (types.Result, error) {
 	switch version {
-	case "0.3.0", implementedSpecVersion:
+	case "0.3.0", ImplementedSpecVersion:
+		r.CNIVersion = version
 		return r, nil
 	case types020.SupportedVersions[0], types020.SupportedVersions[1], types020.SupportedVersions[2]:
 		return r.convertTo020()
@@ -244,12 +247,18 @@ func (i *Interface) String() string {
 	return fmt.Sprintf("%+v", *i)
 }
 
+// Int returns a pointer to the int value passed in.  Used to
+// set the IPConfig.Interface field.
+func Int(v int) *int {
+	return &v
+}
+
 // IPConfig contains values necessary to configure an IP address on an interface
 type IPConfig struct {
 	// IP version, either "4" or "6"
 	Version string
 	// Index into Result structs Interfaces list
-	Interface int
+	Interface *int
 	Address   net.IPNet
 	Gateway   net.IP
 }
@@ -261,7 +270,7 @@ func (i *IPConfig) String() string {
 // JSON (un)marshallable types
 type ipConfig struct {
 	Version   string      `json:"version"`
-	Interface int         `json:"interface,omitempty"`
+	Interface *int        `json:"interface,omitempty"`
 	Address   types.IPNet `json:"address"`
 	Gateway   net.IP      `json:"gateway,omitempty"`
 }
diff --git a/vendor/github.com/containernetworking/cni/pkg/types/types.go b/vendor/github.com/containernetworking/cni/pkg/types/types.go
index 3263015a..64127560 100644
--- a/vendor/github.com/containernetworking/cni/pkg/types/types.go
+++ b/vendor/github.com/containernetworking/cni/pkg/types/types.go
@@ -136,7 +136,11 @@ type Error struct {
 }
 
 func (e *Error) Error() string {
-	return e.Msg
+	details := ""
+	if e.Details != "" {
+		details = fmt.Sprintf("; %v", e.Details)
+	}
+	return fmt.Sprintf("%v%v", e.Msg, details)
 }
 
 func (e *Error) Print() error {