time.c: freeze and preserve marshal-loaded time zone

We need to prevent vtm.zone from pointing to a GC-ed string buffer.
The rb_copy_generic_ivar call misses it because get_attr deleted it.
Thanks to nobu for the rb_str_new_frozen suggestion.

* time.c (time_mload): freeze and preserve marshal-loaded time zone
* test/ruby/test_time.rb: add test for GC on loaded object
  [Bug #9652]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/time.c b/time.c
index 9db276ed82..c8eb6b8223 100644
--- a/time.c
+++ b/time.c
@@ -4827,7 +4827,9 @@ end_submicro: ;
 	time_fixoff(time);
     }
     if (!NIL_P(zone)) {
+	zone = rb_str_new_frozen(zone);
 	tobj->vtm.zone = RSTRING_PTR(zone);
+	rb_ivar_set(time, id_zone, zone);
     }
 
     return time;