[4.0.x] Fixed #33134 -- Fixed recursion depth error when rendering Form with BoundFields.

Regression in 456466d932830b096d39806e291fe23ec5ed38d5.

Backport of 4884a87e022056eda10534c13d74e49b8cdda632 from main

5 files changed, 34 insertions, 1 deletions

diff --git a/django/forms/boundfield.py b/django/forms/boundfield.py
index d1e98719d2..5bbfcbe41c 100644
--- a/django/forms/boundfield.py
+++ b/django/forms/boundfield.py
@@ -177,7 +177,6 @@ class BoundField:
                 else:
                     attrs['class'] = self.form.required_css_class
         context = {
-            'form': self.form,
             'field': self,
             'label': contents,
             'attrs': attrs,
diff --git a/tests/forms_tests/templates/forms_tests/cyclic_context_boundfield_render.html b/tests/forms_tests/templates/forms_tests/cyclic_context_boundfield_render.html
new file mode 100644
index 0000000000..726e82a3a8
--- /dev/null
+++ b/tests/forms_tests/templates/forms_tests/cyclic_context_boundfield_render.html
@@ -0,0 +1,2 @@
+{% load tags %}
+{% count_render %}
diff --git a/tests/forms_tests/templatetags/__init__.py b/tests/forms_tests/templatetags/__init__.py
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/tests/forms_tests/templatetags/__init__.py
diff --git a/tests/forms_tests/templatetags/tags.py b/tests/forms_tests/templatetags/tags.py
new file mode 100644
index 0000000000..060e5008da
--- /dev/null
+++ b/tests/forms_tests/templatetags/tags.py
@@ -0,0 +1,21 @@
+from django.template import Library, Node
+
+register = Library()
+
+
+class CountRenderNode(Node):
+    count = 0
+
+    def render(self, context):
+        self.count += 1
+        for v in context.flatten().values():
+            try:
+                v.render()
+            except AttributeError:
+                pass
+        return str(self.count)
+
+
+@register.tag
+def count_render(parser, token):
+    return CountRenderNode()
diff --git a/tests/forms_tests/tests/test_forms.py b/tests/forms_tests/tests/test_forms.py
index fefebde05c..c478a71699 100644
--- a/tests/forms_tests/tests/test_forms.py
+++ b/tests/forms_tests/tests/test_forms.py
@@ -3954,3 +3954,14 @@ class OverrideTests(SimpleTestCase):
             '<div class="error">This field is required.</div></div>'
             '<p>Comment: <input type="text" name="comment" required></p>',
         )
+
+    def test_cyclic_context_boundfield_render(self):
+        class FirstNameForm(Form):
+            first_name = CharField()
+            template_name_label = 'forms_tests/cyclic_context_boundfield_render.html'
+
+        f = FirstNameForm()
+        try:
+            self.assertInHTML('<th>1</th>', f.render())
+        except RecursionError:
+            self.fail('Cyclic reference in BoundField.render().')