From 03e53516ac31639a47584bd7be655cd2f6f44eb9 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Fri, 5 Mar 2021 18:21:57 +0100
Subject: Oh man... Idfk anymore

---
 kernel/features/mm.c | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'kernel/features/mm.c')

diff --git a/kernel/features/mm.c b/kernel/features/mm.c
index ad70685..b17d9fc 100644
--- a/kernel/features/mm.c
+++ b/kernel/features/mm.c
@@ -128,8 +128,13 @@ u32 virtual_to_physical(struct page_dir *dir, u32 vaddr)
 	u32 pti = PTI(vaddr);
 
 	union page_dir_entry *dir_entry = &dir->entries[pdi];
+	if (!dir_entry->bits.present)
+		return 0;
+
 	struct page_table *table = (struct page_table *)(dir_entry->bits.address * PAGE_SIZE);
 	union page_table_entry *table_entry = &table->entries[pti];
+	if (!table_entry->bits.present)
+		return 0;
 
 	return (table_entry->bits.address * PAGE_SIZE) + (vaddr & (PAGE_SIZE - 1));
 }
-- 
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