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

Backport of r12490 from trunk.

git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12491 bcc190cf-cafb-0310-a4f2-bffc1f526a37

1 files changed, 6 insertions, 0 deletions

diff --git a/django/forms/fields.py b/django/forms/fields.py
index 12316a1ab1..581d32d923 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -240,6 +240,12 @@ class DecimalField(Field):
         except DecimalException:
             raise ValidationError(self.error_messages['invalid'])
 
+        # 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.