Raise an error whena decompression bomb is launched to the thumbs generator

boards/thumbs.py

@@ -25,6 +25,8 b' def generate_thumb(img, thumb_size, form'
                 (this format will be used for the generated thumbnail, too)
     """
 
+    Image.warnings.simplefilter('error', Image.DecompressionBombWarning)
+
     img.seek(0) # see http://code.djangoproject.com/ticket/8222 for details
     image = Image.open(img)
 
@@ -212,4 +214,4 b' class ImageWithThumbsField(ImageField):'
                 thumb_height_ratio = int(original_height * scale_ratio)
 
             setattr(instance, thumb_width_field, thumb_width_ratio)
-            setattr(instance, thumb_height_field, thumb_height_ratio)
  No newline at end of file
+            setattr(instance, thumb_height_field, thumb_height_ratio)