Fixed #7777 -- Added validation handling for NaN, Inf and -Inf in DecimalFields. Thanks to thebitguru for the patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12490 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/forms/fields.py

@@ -283,6 +283,11 @@ class DecimalField(Field):
         super(DecimalField, self).validate(value)
         if value in validators.EMPTY_VALUES:
             return
+        # Check for NaN, Inf and -Inf values. We can't compare directly for NaN,
+        # since it is never equal to itself. However, NaN is the only value that
+        # isn't equal to itself, so we can use this to identify NaN
+        if value != value or value == Decimal("Inf") or value == Decimal("-Inf"):
+            raise ValidationError(self.error_messages['invalid'])
         sign, digittuple, exponent = value.as_tuple()
         decimals = abs(exponent)
         # digittuple doesn't include any leading zeros.
@@ -467,7 +472,7 @@ class ImageField(FileField):
         f = super(ImageField, self).to_python(data)
         if f is None:
             return None
-            
+
         # Try to import PIL in either of the two ways it can end up installed.
         try:
             from PIL import Image
@@ -584,7 +589,7 @@ class ChoiceField(Field):
 
     def __init__(self, choices=(), required=True, widget=None, label=None,
                  initial=None, help_text=None, *args, **kwargs):
-        super(ChoiceField, self).__init__(required=required, widget=widget, label=label, 
+        super(ChoiceField, self).__init__(required=required, widget=widget, label=label,
                                         initial=initial, help_text=help_text, *args, **kwargs)
         self.choices = choices