Merge pull request #52246 from dixudx/suspect_hostpathtype_nil_ptr

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>..

suspect nil HostPathType

**What this PR does / why we need it**:

Nil `HostPathType` is suspicious. @luxas Will help re-verify.

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #52242

**Special notes for your reviewer**:
/assign @luxas @thockin 

**Release note**:

```release-note
None
```

pkg/api/validation/validation.go

@@ -993,7 +993,7 @@ var supportedHostPathTypes = sets.NewString(
 func validateHostPathType(hostPathType *api.HostPathType, fldPath *field.Path) field.ErrorList {
 	allErrs := field.ErrorList{}
 
-	if !supportedHostPathTypes.Has(string(*hostPathType)) {
+	if hostPathType != nil && !supportedHostPathTypes.Has(string(*hostPathType)) {
 		allErrs = append(allErrs, field.NotSupported(fldPath, hostPathType, supportedHostPathTypes.List()))
 	}
 

pkg/volume/host_path/host_path.go

@@ -106,8 +106,14 @@ func (plugin *hostPathPlugin) NewMounter(spec *volume.Spec, pod *v1.Pod, opts vo
 	}
 
 	path := hostPathVolumeSource.Path
+	pathType := new(v1.HostPathType)
+	if hostPathVolumeSource.Type == nil {
+		*pathType = v1.HostPathUnset
+	} else {
+		pathType = hostPathVolumeSource.Type
+	}
 	return &hostPathMounter{
-		hostPath: &hostPath{path: path, pathType: hostPathVolumeSource.Type, containerized: opts.Containerized},
+		hostPath: &hostPath{path: path, pathType: pathType, containerized: opts.Containerized},
 		readOnly: readOnly,
 	}, nil
 }