[3.2.x] Fixed #32949 -- Restored invalid number handling in DecimalField.validate().

DecimalField must itself validate() values, such as NaN, which cannot be
passed to validators, such as MaxValueValidator, during the
run_validators() phase.

Regression in cc3d24d7d577f174937a0744d886c4c7123cfa85.

Backport of c542d0a07237033225c1d57337ca9474a00648f2 from main

1 files changed, 11 insertions, 0 deletions

diff --git a/django/forms/fields.py b/django/forms/fields.py
index 17c7956b53..0214d60c1c 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -350,6 +350,17 @@ class DecimalField(IntegerField):
             raise ValidationError(self.error_messages['invalid'], code='invalid')
         return value
 
+    def validate(self, value):
+        super().validate(value)
+        if value in self.empty_values:
+            return
+        if not value.is_finite():
+            raise ValidationError(
+                self.error_messages['invalid'],
+                code='invalid',
+                params={'value': value},
+            )
+
     def widget_attrs(self, widget):
         attrs = super().widget_attrs(widget)
         if isinstance(widget, NumberInput) and 'step' not in widget.attrs: