* eval_intern.h (CHECK_STACK_OVERFLOW): it was not intended to add

size_t to a pointer typed VALUE*.  Coverity Scan found this defect.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29800 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Mon Nov 15 23:54:45 2010  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* eval_intern.h (CHECK_STACK_OVERFLOW): it was not intended to add
+	  size_t to a pointer typed VALUE*.  Coverity Scan found this defect.
+
 Mon Nov 15 23:41:21 2010  Yusuke Endoh  <mame@tsg.ne.jp>
 
 	* compile.c (iseq_set_exception_local_table, iseq_set_local_table,

eval_intern.h

@@ -172,7 +172,7 @@ enum ruby_tag_type {
 #define SCOPE_SET(f)   (rb_vm_cref()->nd_visi = (f))
 
 #define CHECK_STACK_OVERFLOW(cfp, margin) do \
-  if (((VALUE *)(cfp)->sp) + (margin) + sizeof(rb_control_frame_t) >= ((VALUE *)cfp)) { \
+  if ((VALUE *)((char *)(((VALUE *)(cfp)->sp) + (margin)) + sizeof(rb_control_frame_t)) >= ((VALUE *)cfp)) { \
       rb_exc_raise(sysstack_error); \
   } \
 while (0)