Merge pull request #37504 from qarmin/out_of_bound_cursor

Fix array out of bounds access caused by uninitialised variables

core/class_db.cpp

@@ -261,6 +261,7 @@ HashMap<StringName, StringName> ClassDB::compat_classes;
 ClassDB::ClassInfo::ClassInfo() {
 
 	api = API_NONE;
+	class_ptr = nullptr;
 	creation_func = NULL;
 	inherits_ptr = NULL;
 	disabled = false;

core/math/expression.cpp

@@ -2215,6 +2215,8 @@ Expression::Expression() :
 		root(NULL),
 		nodes(NULL),
 		execution_error(false) {
+	str_ofs = 0;
+	expression_dirty = false;
 }
 
 Expression::~Expression() {