normal	2018-07-03 18:06:28 +0900 (Tue, 03 Jul 2018)

  New Revision: 63837

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63837

  Log:
    vm.c (rb_source_location): check for NULL cfp->iseq
    
    rb_vm_get_sourceline returns zero if cfp->iseq is NULL,
    so rb_iseq_path should not try to follow NULL cfp->iseq,
    either.

  Modified files:
    trunk/vm.c
Index: vm.c
===================================================================
--- vm.c	(revision 63836)
+++ vm.c	(revision 63837)
@@ -1291,7 +1291,7 @@ rb_source_location(int *pline) https://github.com/ruby/ruby/blob/trunk/vm.c#L1291
     const rb_execution_context_t *ec = GET_EC();
     const rb_control_frame_t *cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
-    if (cfp) {
+    if (cfp && cfp->iseq) {
 	if (pline) *pline = rb_vm_get_sourceline(cfp);
 	return rb_iseq_path(cfp->iseq);
     }

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