[hid_core] fix bounds-check aruid index in GetControllerFromNpadIdType (#4064)

GetIndexFromAruid returns AruidIndexMax as the “not found” value, but both
GetControllerFromNpadIdType overloads were using that value to index
controller_data without checking it first.

when a game routes through DisconnectNpad before its applet resource is
registered, we can end up indexing past the end of controller_data. That seems
to be what was crashing some games on launch, especially on macOS and Android,
where the out-of-bounds read is less likely to just slide by unnoticed.

So yeah, AruidIndexMax is a sentinel, not a real controller_data index, so we
should not treat it like one.

  Fixes: https://github.com/eden-emulator/Issue-Reports/issues/438
  Fixes: https://github.com/eden-emulator/Issue-Reports/issues/439

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4064
Reviewed-by: Lizzie <lizzie@eden-emu.dev>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/core/file_sys/control_metadata.cpp

@@ -128,25 +128,32 @@ const LanguageEntry& NACP::GetLanguageEntry() const {
         case Settings::Language::Russian: return Language::Russian;
         case Settings::Language::Spanish: return Language::Spanish;
         case Settings::Language::SpanishLatin: return Language::LatinAmericanSpanish;
-        case Settings::Language::Taiwanese: return Language::SimplifiedChinese;
+        case Settings::Language::Taiwanese: return Language::TraditionalChinese;
         case Settings::Language::Thai: return Language::Thai;
         case Settings::Language::Polish: return Language::Polish;
         default: return Language::AmericanEnglish;
         }
     }();
 
-    u32 index = u32(language);
+    const auto index = static_cast<size_t>(language);
 
-    if (index < language_entries.size() && !language_entries[index].GetApplicationName().empty()) {
+    if (index < language_entries.size() &&
+        !language_entries[index].GetApplicationName().empty()) {
         return language_entries[index];
     }
 
     for (const auto& entry : language_entries) {
-        if (!entry.GetApplicationName().empty())
-          return entry;
+        if (!entry.GetApplicationName().empty()) {
+            return entry;
+        }
     }
 
-    return language_entries.at(static_cast<u8>(Language::AmericanEnglish));
+    if (!language_entries.empty()) {
+        return language_entries.front();
+    }
+
+    static const LanguageEntry empty_entry{};
+    return empty_entry;
 }
 
 std::vector<std::string> NACP::GetApplicationNames() const {

src/hid_core/resources/npad/npad.cpp

@@ -1144,7 +1144,11 @@ NPad::NpadControllerData& NPad::GetControllerFromNpadIdType(u64 aruid,
         npad_id = Core::HID::NpadIdType::Player1;
     }
     const auto npad_index = NpadIdTypeToIndex(npad_id);
-    const auto aruid_index = applet_resource_holder.applet_resource->GetIndexFromAruid(aruid);
+    auto aruid_index = applet_resource_holder.applet_resource->GetIndexFromAruid(aruid);
+    if (aruid_index >= AruidIndexMax) {
+        LOG_ERROR(Service_HID, "Invalid aruid:{:016X}", aruid);
+        aruid_index = 0;
+    }
     return controller_data[aruid_index][npad_index];
 }
 
@@ -1155,7 +1159,11 @@ const NPad::NpadControllerData& NPad::GetControllerFromNpadIdType(
         npad_id = Core::HID::NpadIdType::Player1;
     }
     const auto npad_index = NpadIdTypeToIndex(npad_id);
-    const auto aruid_index = applet_resource_holder.applet_resource->GetIndexFromAruid(aruid);
+    auto aruid_index = applet_resource_holder.applet_resource->GetIndexFromAruid(aruid);
+    if (aruid_index >= AruidIndexMax) {
+        LOG_ERROR(Service_HID, "Invalid aruid:{:016X}", aruid);
+        aruid_index = 0;
+    }
     return controller_data[aruid_index][npad_index];
 }