Fix crash in method call in `ObjectSpace.each_object` block.

* Filter `MRB_TT_ENV` and `MRB_TT_ICLASS`.
* Set `mrb->string_class` in `mrb_init_exception` instead.

2 files changed, 11 insertions, 0 deletions

diff --git a/mrbgems/mruby-objectspace/src/mruby_objectspace.c b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
index ba22fc990..8c7452c1e 100644
--- a/mrbgems/mruby-objectspace/src/mruby_objectspace.c
+++ b/mrbgems/mruby-objectspace/src/mruby_objectspace.c
@@ -119,6 +119,13 @@ os_each_object_cb(mrb_state *mrb, struct RBasic *obj, void *ud)
     return;
   }
 
+  /* filter internal objects */
+  switch (obj->tt) {
+  case MRB_TT_ENV:
+  case MRB_TT_ICLASS:
+    return;
+  }
+
   /* filter class kind if target module defined */
   if (d->target_module && !mrb_obj_is_kind_of(mrb, mrb_obj_value(obj), d->target_module)) {
     return;
diff --git a/mrbgems/mruby-objectspace/test/objectspace.rb b/mrbgems/mruby-objectspace/test/objectspace.rb
index f792c165d..4731d53b5 100644
--- a/mrbgems/mruby-objectspace/test/objectspace.rb
+++ b/mrbgems/mruby-objectspace/test/objectspace.rb
@@ -54,3 +54,7 @@ assert('ObjectSpace.each_object') do
   assert_equal arys.length, arys_count
   assert_true arys.length < objs.length
 end
+
+assert 'Check class pointer of ObjectSpace.each_object.' do
+  ObjectSpace.each_object { |obj| !obj }
+end