PublishAllPorts: don't crash with nil PortBindings

Introduced by commit 85b260f ("PublishAllPorts: create
port mappings for exposed ports").

Signed-off-by: Rob Murray <rob.murray@docker.com>

daemon/internal/runconfig/config.go

@@ -42,6 +42,9 @@ func decodeCreateRequest(src io.Reader) (container.CreateRequest, error) {
 	if w.HostConfig == nil {
 		w.HostConfig = &container.HostConfig{}
 	}
+	if w.HostConfig.PortBindings == nil {
+		w.HostConfig.PortBindings = make(network.PortMap)
+	}
 	// Make sure NetworkMode has an acceptable value. We do this to ensure
 	// backwards compatible API behavior.
 	//

integration/internal/container/ops.go

@@ -72,6 +72,13 @@ func WithSysctls(sysctls map[string]string) func(*TestContainerConfig) {
 	}
 }
 
+// WithPublishAllPorts sets PublishAllPorts.
+func WithPublishAllPorts(publishAll bool) func(*TestContainerConfig) {
+	return func(c *TestContainerConfig) {
+		c.HostConfig.PublishAllPorts = publishAll
+	}
+}
+
 // WithExposedPorts sets the exposed ports of the container
 func WithExposedPorts(ports ...string) func(*TestContainerConfig) {
 	return func(c *TestContainerConfig) {

integration/networking/bridge_linux_test.go

@@ -22,12 +22,14 @@ import (
 	"github.com/moby/moby/v2/daemon/libnetwork/drivers/bridge"
 	"github.com/moby/moby/v2/daemon/libnetwork/iptables"
 	"github.com/moby/moby/v2/daemon/libnetwork/netlabel"
+	"github.com/moby/moby/v2/integration/internal/build"
 	"github.com/moby/moby/v2/integration/internal/container"
 	"github.com/moby/moby/v2/integration/internal/network"
 	"github.com/moby/moby/v2/integration/internal/testutils/networking"
 	n "github.com/moby/moby/v2/integration/network"
 	"github.com/moby/moby/v2/internal/testutil"
 	"github.com/moby/moby/v2/internal/testutil/daemon"
+	"github.com/moby/moby/v2/internal/testutil/fakecontext"
 	"gotest.tools/v3/assert"
 	is "gotest.tools/v3/assert/cmp"
 	"gotest.tools/v3/icmd"
@@ -2139,3 +2141,18 @@ func TestGatewayErrorOnNetDisconnect(t *testing.T) {
 	assert.Check(t, is.Contains(ctrInsp.NetworkSettings.Networks, "n1"))
 	assert.Check(t, is.Contains(ctrInsp.NetworkSettings.Networks, "n2"))
 }
+
+// Regression test for https://github.com/moby/moby/issues/51620
+func TestPublishAllWithNilPortBindings(t *testing.T) {
+	ctx := setupTest(t)
+	c := testEnv.APIClient()
+
+	imgWithExpose := container.WithImage(build.Do(ctx, t, c,
+		fakecontext.New(t, "", fakecontext.WithDockerfile("FROM busybox\nEXPOSE 80/tcp\n"))))
+
+	_ = container.Run(ctx, t, c,
+		container.WithAutoRemove,
+		container.WithPublishAllPorts(true),
+		imgWithExpose,
+	)
+}