Patch from the upstream git

https://github.com/kkos/oniguruma/issues/58 (CVE-2017-9227)

Thanks to Mamoru TASAKA <mtasaka@fedoraproject.org>

ext/mbstring/oniguruma/regexec.c

@@ -3123,6 +3123,8 @@ forward_search_range(regex_t* reg, const UChar* str, const UChar* end, UChar* s,
     }
     else {
       UChar *q = p + reg->dmin;
+
+      if (q >= end) return 0; /* fail */
       while (p < q) p += enclen(reg->enc, p);
     }
   }