Fix next table overwriting old page handle

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/x86_64/src/memory/paging/page_table.cpp b/arch/x86_64/src/memory/paging/page_table.cpp
index a39c235..eb11810 100644
--- a/arch/x86_64/src/memory/paging/page_table.cpp
+++ b/arch/x86_64/src/memory/paging/page_table.cpp
@@ -100,14 +100,15 @@ namespace teachos::arch::memory::paging
 
   auto page_table_handle::is_empty() const -> bool { return table->is_empty(); }
 
-  auto page_table_handle::next_table(std::size_t table_index) -> std::optional<page_table_handle>
+  auto page_table_handle::next_table(std::size_t table_index) const -> std::optional<page_table_handle>
   {
     exception_handling::assert(table_level != page_table_handle::LEVEL1,
                                "[Page Table] Attempted to call next_table on level 1 page table");
     auto const next_table = table->next_table(table_index);
     if (next_table.has_value())
     {
-      return page_table_handle{next_table.value(), --table_level};
+      auto const new_level = static_cast<page_table_handle::level>(table_level - 1);
+      return page_table_handle{next_table.value(), new_level};
     }
     return std::nullopt;
   }