Fixed #7673: make sure to rewind uploaded image data when validating ImageFields. Thanks, Mike Axiak.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@7907 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/newforms/fields.py

@@ -507,6 +507,8 @@ class ImageField(FileField):
             trial_image.verify()
         except Exception: # Python Imaging Library doesn't recognize it as an image
             raise ValidationError(self.error_messages['invalid_image'])
+        if hasattr(f, 'seek') and callable(f.seek):
+            f.seek(0)
         return f
 
 url_re = re.compile(