Merge pull request #47236 from dixudx/not_allow_backsteps_in_local_volume

Automatic merge from submit-queue (batch tested with PRs 34515, 47236, 46694, 47819, 47792)

not allow backsteps in local volume plugin

**Which issue this PR fixes** : fixes #47207

**Special notes for your reviewer**:
cc @msau42 @ddysher
Just follow @liggitt [commented](https://github.com/kubernetes/kubernetes/issues/47107#issuecomment-306831175).

**Release note**:
```release-note
NONE
```

pkg/api/validation/validation.go

@@ -1133,7 +1133,10 @@ func validateLocalVolumeSource(ls *api.LocalVolumeSource, fldPath *field.Path) f
 	allErrs := field.ErrorList{}
 	if ls.Path == "" {
 		allErrs = append(allErrs, field.Required(fldPath.Child("path"), ""))
+		return allErrs
 	}
+
+	allErrs = append(allErrs, validatePathNoBacksteps(ls.Path, fldPath.Child("path"))...)
 	return allErrs
 }