diff --git a/mm/filemap.c b/mm/filemap.c
index 31729c67be9439fda641ced29a087849f262d545..446b6d6c4e64e115e84a1248f3efabce0432658d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2464,6 +2464,9 @@ ssize_t generic_file_buffered_read(struct kiocb *iocb,
 
 	if (unlikely(iocb->ki_pos >= inode->i_sb->s_maxbytes))
 		return 0;
+	if (unlikely(!iov_iter_count(iter)))
+		return 0;
+
 	iov_iter_truncate(iter, inode->i_sb->s_maxbytes);
 
 	if (nr_pages > ARRAY_SIZE(pages_onstack))