merges r21163 from trunk into ruby_1_9_1.

* vm.c (vm_set_eval_stack, vm_set_main_stack, vm_set_top_stack):
  check stack overflow.  [ruby-dev:37646]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@21189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 11 insertions, 0 deletions

diff --git a/ChangeLog b/ChangeLog
index b997d0f099..b859406552 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Mon Dec 29 16:16:20 2008  Koichi Sasada  <ko1@atdot.net>
+
+	* vm.c (vm_set_eval_stack, vm_set_main_stack, vm_set_top_stack): 
+	  check stack overflow.  [ruby-dev:37646]
+
 Mon Dec 29 14:50:19 2008  Yuki Sonoda (Yugui)  <yugui@yugui.jp>
 
 	* Makefile.in (ext-clean): ext-clean always fails.
diff --git a/vm.c b/vm.c
index ddb736c089..2469d5ea4e 100644
--- a/vm.c
+++ b/vm.c
@@ -77,6 +77,8 @@ vm_set_top_stack(rb_thread_t * th, VALUE iseqval)
     vm_push_frame(th, iseq, VM_FRAME_MAGIC_TOP,
 		  th->top_self, 0, iseq->iseq_encoded,
 		  th->cfp->sp, 0, iseq->local_size);
+
+        CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
 }
 
 static void
@@ -95,6 +97,8 @@ vm_set_eval_stack(rb_thread_t * th, VALUE iseqval, const NODE *cref)
     if (cref) {
 	th->cfp->dfp[-1] = (VALUE)cref;
     }
+
+    CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
 }
 
 static void
@@ -116,6 +120,8 @@ vm_set_main_stack(rb_thread_t *th, VALUE iseqval)
     if (bind && iseq->local_size > 0) {
 	bind->env = vm_make_env_object(th, th->cfp);
     }
+
+    CHECK_STACK_OVERFLOW(th->cfp, iseq->stack_max);
 }
 
 rb_control_frame_t *