nobu	2018-11-10 18:29:00 +0900 (Sat, 10 Nov 2018)

  New Revision: 65650

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65650

  Log:
    Fix potential NULL pointer access [ci skip]

  Modified files:
    trunk/compile.c
Index: compile.c
===================================================================
--- compile.c	(revision 65649)
+++ compile.c	(revision 65650)
@@ -1406,6 +1406,7 @@ static int https://github.com/ruby/ruby/blob/trunk/compile.c#L1406
 get_dyna_var_idx(const rb_iseq_t *iseq, ID id, int *level, int *ls)
 {
     int lv = 0, idx = -1;
+    const rb_iseq_t *const topmost_iseq = iseq;
 
     while (iseq) {
 	idx = get_dyna_var_idx_at_raw(iseq, id);
@@ -1417,7 +1418,7 @@ get_dyna_var_idx(const rb_iseq_t *iseq, https://github.com/ruby/ruby/blob/trunk/compile.c#L1418
     }
 
     if (idx < 0) {
-        COMPILE_ERROR(iseq, ISEQ_LAST_LINE(iseq),
+        COMPILE_ERROR(topmost_iseq, ISEQ_LAST_LINE(topmost_iseq),
                       "get_dyna_var_idx: -1");
     }
 

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