Fixed #17159 -- Validated returned number of next|previous_page_number

Thanks mehta.apurva at gmail.com for the report and the initial patch
and neaf for the complete patch.

1 files changed, 2 insertions, 2 deletions

diff --git a/django/core/paginator.py b/django/core/paginator.py
index 8b4d2891b2..6b0b3542f8 100644
--- a/django/core/paginator.py
+++ b/django/core/paginator.py
@@ -132,10 +132,10 @@ class Page(object):
         return self.has_previous() or self.has_next()
 
     def next_page_number(self):
-        return self.number + 1
+        return self.paginator.validate_number(self.number + 1)
 
     def previous_page_number(self):
-        return self.number - 1
+        return self.paginator.validate_number(self.number - 1)
 
     def start_index(self):
         """