Ticket #13901: file_chunks_2.diff

django/core/files/base.py

@@ -65 +65 @@
         counter = self.size
 
         while counter > 0:
-            yield self.read(chunk_size)
-            counter -= chunk_size
+            chunk = self.read(chunk_size)
+            yield chunk
+            counter -= len(chunk)
 
     def multiple_chunks(self, chunk_size=None):
         """