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.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63837 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/vm.c b/vm.c
index 3cc0f94ebd..efdbff9a23 100644
--- a/vm.c
+++ b/vm.c
@@ -1291,7 +1291,7 @@ rb_source_location(int *pline)
     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);
     }