From 0aa7fea250f9f8ea7d0f30df8954ea89ee04db49 Mon Sep 17 00:00:00 2001
From: 4lDO2 <4lDO2@protonmail.com>
Date: Wed, 21 Jun 2023 12:58:39 +0200
Subject: [PATCH] Fix remap bug: require present before remapping.

---
 src/page/mapper.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/page/mapper.rs b/src/page/mapper.rs
index 33b700f35e..b32c2e2b66 100644
--- a/src/page/mapper.rs
+++ b/src/page/mapper.rs
@@ -70,6 +70,7 @@ impl<A: Arch, F: FrameAllocator> PageMapper<A, F> {
     pub unsafe fn remap(&mut self, virt: VirtualAddress, flags: PageFlags<A>) -> Option<PageFlush<A>> {
         self.visit(virt, |p1, i| {
             let mut entry = p1.entry(i)?;
+            entry.address().ok()?;
             entry.set_flags(flags);
             p1.set_entry(i, entry);
             Some(PageFlush::new(virt))