From 1c773c0869b95d749613e08301637a0b80f1bbc9 Mon Sep 17 00:00:00 2001
From: Morph <39850852+Morph1984@users.noreply.github.com>
Date: Sat, 12 Dec 2020 06:37:08 -0500
Subject: controllers/npad: Validate device handles before use

Some games such as NEKOPARA Vol. 3 send invalid device handles when calling InitializeVibrationDevice. Introduce a check to validate the device handle before use.
---
 src/core/hle/service/hid/controllers/npad.cpp | 41 +++++++++++++++++++++++++++
 src/core/hle/service/hid/controllers/npad.h   |  4 +++
 2 files changed, 45 insertions(+)

(limited to 'src/core')

diff --git a/src/core/hle/service/hid/controllers/npad.cpp b/src/core/hle/service/hid/controllers/npad.cpp
index 66c4fe60a..f6a0770bf 100644
--- a/src/core/hle/service/hid/controllers/npad.cpp
+++ b/src/core/hle/service/hid/controllers/npad.cpp
@@ -116,6 +116,31 @@ u32 Controller_NPad::IndexToNPad(std::size_t index) {
     }
 }
 
+bool Controller_NPad::IsNpadIdValid(u32 npad_id) {
+    switch (npad_id) {
+    case 0:
+    case 1:
+    case 2:
+    case 3:
+    case 4:
+    case 5:
+    case 6:
+    case 7:
+    case NPAD_UNKNOWN:
+    case NPAD_HANDHELD:
+        return true;
+    default:
+        LOG_ERROR(Service_HID, "Invalid npad id {}", npad_id);
+        return false;
+    }
+}
+
+bool Controller_NPad::IsDeviceHandleValid(const DeviceHandle& device_handle) {
+    return IsNpadIdValid(device_handle.npad_id) &&
+           device_handle.npad_type < NpadType::MaxNpadType &&
+           device_handle.device_index < DeviceIndex::MaxDeviceIndex;
+}
+
 Controller_NPad::Controller_NPad(Core::System& system) : ControllerBase(system), system(system) {}
 
 Controller_NPad::~Controller_NPad() {
@@ -742,6 +767,10 @@ bool Controller_NPad::VibrateControllerAtIndex(std::size_t npad_index, std::size
 
 void Controller_NPad::VibrateController(const DeviceHandle& vibration_device_handle,
                                         const VibrationValue& vibration_value) {
+    if (!IsDeviceHandleValid(vibration_device_handle)) {
+        return;
+    }
+
     if (!Settings::values.vibration_enabled.GetValue() && !permit_vibration_session_enabled) {
         return;
     }
@@ -798,12 +827,20 @@ void Controller_NPad::VibrateControllers(const std::vector<DeviceHandle>& vibrat
 
 Controller_NPad::VibrationValue Controller_NPad::GetLastVibration(
     const DeviceHandle& vibration_device_handle) const {
+    if (!IsDeviceHandleValid(vibration_device_handle)) {
+        return {};
+    }
+
     const auto npad_index = NPadIdToIndex(vibration_device_handle.npad_id);
     const auto device_index = static_cast<std::size_t>(vibration_device_handle.device_index);
     return latest_vibration_values[npad_index][device_index];
 }
 
 void Controller_NPad::InitializeVibrationDevice(const DeviceHandle& vibration_device_handle) {
+    if (!IsDeviceHandleValid(vibration_device_handle)) {
+        return;
+    }
+
     const auto npad_index = NPadIdToIndex(vibration_device_handle.npad_id);
     const auto device_index = static_cast<std::size_t>(vibration_device_handle.device_index);
     InitializeVibrationDeviceAtIndex(npad_index, device_index);
@@ -824,6 +861,10 @@ void Controller_NPad::SetPermitVibrationSession(bool permit_vibration_session) {
 }
 
 bool Controller_NPad::IsVibrationDeviceMounted(const DeviceHandle& vibration_device_handle) const {
+    if (!IsDeviceHandleValid(vibration_device_handle)) {
+        return false;
+    }
+
     const auto npad_index = NPadIdToIndex(vibration_device_handle.npad_id);
     const auto device_index = static_cast<std::size_t>(vibration_device_handle.device_index);
     return vibration_devices_mounted[npad_index][device_index];
diff --git a/src/core/hle/service/hid/controllers/npad.h b/src/core/hle/service/hid/controllers/npad.h
index 96f319294..9fac00231 100644
--- a/src/core/hle/service/hid/controllers/npad.h
+++ b/src/core/hle/service/hid/controllers/npad.h
@@ -56,12 +56,14 @@ public:
         JoyconLeft = 6,
         JoyconRight = 7,
         Pokeball = 9,
+        MaxNpadType = 10,
     };
 
     enum class DeviceIndex : u8 {
         Left = 0,
         Right = 1,
         None = 2,
+        MaxDeviceIndex = 3,
     };
 
     enum class GyroscopeZeroDriftMode : u32 {
@@ -213,6 +215,8 @@ public:
     static Settings::ControllerType MapNPadToSettingsType(Controller_NPad::NPadControllerType type);
     static std::size_t NPadIdToIndex(u32 npad_id);
     static u32 IndexToNPad(std::size_t index);
+    static bool IsNpadIdValid(u32 npad_id);
+    static bool IsDeviceHandleValid(const DeviceHandle& device_handle);
 
 private:
     struct CommonHeader {
-- 
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