PEGASUS: Disallow loading / saving from the GMM from inner loops

InputDeviceManager::pumpEvents is called from neighborhood classes that
are destroyed when loading.
Don't allow loading from that method to prevent use after free bugs.

2 files changed, 10 insertions, 6 deletions

diff --git a/engines/pegasus/input.cpp b/engines/pegasus/input.cpp
index 47ec44a736..36a84dbd3c 100644
--- a/engines/pegasus/input.cpp
+++ b/engines/pegasus/input.cpp
@@ -223,10 +223,18 @@ bool InputDeviceManager::notifyEvent(const Common::Event &event) {
 }
 
 void InputDeviceManager::pumpEvents() {
+	PegasusEngine *vm = ((PegasusEngine *)g_engine);
+
+	bool saveAllowed = vm->swapSaveAllowed(false);
+	bool openAllowed = vm->swapLoadAllowed(false);
+
 	// Just poll for events. notifyEvent() will pick up on them.
 	Common::Event event;
 	while (g_system->getEventManager()->pollEvent(event))
 		;
+
+	vm->swapSaveAllowed(saveAllowed);
+	vm->swapLoadAllowed(openAllowed);
 }
 
 int operator==(const Input &arg1, const Input &arg2) {
diff --git a/engines/pegasus/neighborhood/mars/mars.cpp b/engines/pegasus/neighborhood/mars/mars.cpp
index 432909596e..6e3795d250 100644
--- a/engines/pegasus/neighborhood/mars/mars.cpp
+++ b/engines/pegasus/neighborhood/mars/mars.cpp
@@ -2422,9 +2422,7 @@ void Mars::doCanyonChase() {
 				_vm->drawScaledFrame(frame, 0, 0);
 		}
 
-		Common::Event event;
-		while (g_system->getEventManager()->pollEvent(event))
-			;
+		InputDevice.pumpEvents();
 
 		g_system->delayMillis(10);
 	}
@@ -3055,9 +3053,7 @@ void Mars::transportToRobotShip() {
 				_vm->drawScaledFrame(frame, 0, 0);
 		}
 
-		Common::Event event;
-		while (g_system->getEventManager()->pollEvent(event))
-			;
+		InputDevice.pumpEvents();
 
 		g_system->delayMillis(10);
 	}