From 07f71e2620f4a26f251d1708859ba53ffc831c14 Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Tue, 25 Jul 2023 09:51:06 -0400
Subject: memory: check page against address space size

---
 src/core/memory.cpp | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index 179685b72..09c53ea92 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -24,6 +24,16 @@
 
 namespace Core::Memory {
 
+namespace {
+
+bool AddressSpaceContains(const Common::PageTable& table, const Common::ProcessAddress addr,
+                          const std::size_t size) {
+    const Common::ProcessAddress max_addr = 1ULL << table.GetAddressSpaceBits();
+    return addr + size >= addr && addr + size <= max_addr;
+}
+
+} // namespace
+
 // Implementation class used to keep the specifics of the memory subsystem hidden
 // from outside classes. This also allows modification to the internals of the memory
 // subsystem without needing to rebuild all files that make use of the memory interface.
@@ -191,6 +201,11 @@ struct Memory::Impl {
         std::size_t page_offset = addr & YUZU_PAGEMASK;
         bool user_accessible = true;
 
+        if (!AddressSpaceContains(page_table, addr, size)) [[unlikely]] {
+            on_unmapped(size, addr);
+            return false;
+        }
+
         while (remaining_size) {
             const std::size_t copy_amount =
                 std::min(static_cast<std::size_t>(YUZU_PAGESIZE) - page_offset, remaining_size);
@@ -420,7 +435,7 @@ struct Memory::Impl {
     }
 
     void MarkRegionDebug(u64 vaddr, u64 size, bool debug) {
-        if (vaddr == 0) {
+        if (vaddr == 0 || !AddressSpaceContains(*current_page_table, vaddr, size)) {
             return;
         }
 
@@ -476,7 +491,7 @@ struct Memory::Impl {
     }
 
     void RasterizerMarkRegionCached(u64 vaddr, u64 size, bool cached) {
-        if (vaddr == 0) {
+        if (vaddr == 0 || !AddressSpaceContains(*current_page_table, vaddr, size)) {
             return;
         }
 
@@ -611,7 +626,7 @@ struct Memory::Impl {
         // AARCH64 masks the upper 16 bit of all memory accesses
         vaddr = vaddr & 0xffffffffffffULL;
 
-        if (vaddr >= 1uLL << current_page_table->GetAddressSpaceBits()) {
+        if (!AddressSpaceContains(*current_page_table, vaddr, 1)) [[unlikely]] {
             on_unmapped();
             return nullptr;
         }
-- 
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