From d56a19cbf526190de036130fe3a5bf14a0705ee2 Mon Sep 17 00:00:00 2001
From: Bouke van der Bijl <boukevanderbijl@gmail.com>
Date: Fri, 2 Dec 2016 09:48:28 -0500
Subject: Don't generate code for NODE_NEGATE if the result isn't used

Reported by https://hackerone.com/haquaman
---
 mrbgems/mruby-compiler/core/codegen.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'mrbgems/mruby-compiler')

diff --git a/mrbgems/mruby-compiler/core/codegen.c b/mrbgems/mruby-compiler/core/codegen.c
index b2cd12225..891c4f62b 100644
--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -2223,6 +2223,10 @@ codegen(codegen_scope *s, node *tree, int val)
     {
       nt = (intptr_t)tree->car;
       tree = tree->cdr;
+      if (!val) {
+        codegen(s, tree, NOVAL);
+        break;
+      }
       switch (nt) {
       case NODE_FLOAT:
         {
-- 
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