From ae44e80668657a93dc316b9c7d3524ed311fb3dc Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Wed, 6 Dec 2017 14:30:12 +0900
Subject: Limit `ecall()` depth to 32 (default).

---
 src/vm.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/vm.c b/src/vm.c
index de2ac983c..f8c2d510f 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -53,6 +53,11 @@ void abort(void);
 #define MRB_FUNCALL_DEPTH_MAX 512
 #endif
 
+/* Maximum depth of ecall() recursion. */
+#ifndef MRB_ECALL_DEPTH_MAX
+#define MRB_ECALL_DEPTH_MAX 32
+#endif
+
 /* Maximum stack depth. Should be set lower on memory constrained systems.
 The value below allows about 60000 recursive calls in the simplest case. */
 #ifndef MRB_STACK_MAX
@@ -319,7 +324,7 @@ ecall(mrb_state *mrb)
   int nregs;
 
   if (i<0) return;
-  if (ci - c->cibase > MRB_FUNCALL_DEPTH_MAX) {
+  if (ci - c->cibase > MRB_ECALL_DEPTH_MAX) {
     mrb_exc_raise(mrb, mrb_obj_value(mrb->stack_err));
   }
   p = c->ensure[i];
-- 
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