From 9f3f615e054663fd6e538fa2db86271b467a6bfd Mon Sep 17 00:00:00 2001
From: Liam <byteslice@airmail.cc>
Date: Fri, 14 Jul 2023 22:32:24 -0400
Subject: core: reduce TOCTTOU memory access

---
 src/core/debugger/gdbstub.cpp | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

(limited to 'src/core/debugger/gdbstub.cpp')

diff --git a/src/core/debugger/gdbstub.cpp b/src/core/debugger/gdbstub.cpp
index da6078372..0f839d5b4 100644
--- a/src/core/debugger/gdbstub.cpp
+++ b/src/core/debugger/gdbstub.cpp
@@ -261,10 +261,8 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
         const size_t addr{static_cast<size_t>(strtoll(command.data(), nullptr, 16))};
         const size_t size{static_cast<size_t>(strtoll(command.data() + sep, nullptr, 16))};
 
-        if (system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
-            std::vector<u8> mem(size);
-            system.ApplicationMemory().ReadBlock(addr, mem.data(), size);
-
+        std::vector<u8> mem(size);
+        if (system.ApplicationMemory().ReadBlock(addr, mem.data(), size)) {
             SendReply(Common::HexToString(mem));
         } else {
             SendReply(GDB_STUB_REPLY_ERR);
@@ -281,8 +279,7 @@ void GDBStub::ExecuteCommand(std::string_view packet, std::vector<DebuggerAction
         const auto mem_substr{std::string_view(command).substr(mem_sep)};
         const auto mem{Common::HexStringToVector(mem_substr, false)};
 
-        if (system.ApplicationMemory().IsValidVirtualAddressRange(addr, size)) {
-            system.ApplicationMemory().WriteBlock(addr, mem.data(), size);
+        if (system.ApplicationMemory().WriteBlock(addr, mem.data(), size)) {
             system.InvalidateCpuInstructionCacheRange(addr, size);
             SendReply(GDB_STUB_REPLY_OK);
         } else {
-- 
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