Escape the description param from heat template

The heat template allows user to define custom parameters,
the fields are then converted to input fields. The description
param maps to the help_text attribute of the field.

Since the value comes from the user, the value must be escaped
before rendering.

Co-Authored-By: Lin Hua Cheng <os.lcheng@gmail.com>
Change-Id: I79d540a8363b2507c4bccdc0cc38e283962919d2
Closes-bug: #1453074

openstack_dashboard/dashboards/project/stacks/forms.py

@@ -13,6 +13,7 @@
 import json
 import logging
 
+from django.utils import html
 from django.utils.translation import ugettext_lazy as _
 from django.views.decorators.debug import sensitive_variables  # noqa
 
@@ -310,7 +311,7 @@ class CreateStackForm(forms.SelfHandlingForm):
             field_args = {
                 'initial': param.get('Default', None),
                 'label': param.get('Label', param_key),
-                'help_text': param.get('Description', ''),
+                'help_text': html.escape(param.get('Description', '')),
                 'required': param.get('Default', None) is None
             }