From a8bd06904decf2a4641c068fcb271b5b13d37914 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Fri, 18 Aug 2017 23:41:31 +0900
Subject: `mrb_str_cat`: `capa` should not be zero to avoid infinite loops.

---
 src/string.c | 1 +
 1 file changed, 1 insertion(+)

(limited to 'src')

diff --git a/src/string.c b/src/string.c
index e382b470c..c2526f354 100644
--- a/src/string.c
+++ b/src/string.c
@@ -2566,6 +2566,7 @@ mrb_str_cat(mrb_state *mrb, mrb_value str, const char *ptr, size_t len)
     mrb_raise(mrb, E_ARGUMENT_ERROR, "string size too big");
   }
   if (capa <= total) {
+    if (capa == 0) capa = 1;
     while (capa <= total) {
       if (capa <= MRB_INT_MAX / 2) {
         capa *= 2;
-- 
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