From 8e6852572c44b407cbe1d8ec92262d7e64d4d6b0 Mon Sep 17 00:00:00 2001
From: q66 <daniel@octaforge.org>
Date: Mon, 1 Jan 2018 02:36:05 +0100
Subject: [PATCH] reject surrogate code points in decoding

---
 src/string.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/string.cc b/src/string.cc
index c79b76c..faaadc2 100644
--- a/src/string.cc
+++ b/src/string.cc
@@ -57,6 +57,10 @@ namespace detail {
         if ((ret > MaxCodepoint) || (ret <= ulim[n])) {
             return false;
         }
+        /* invalid sequence - surrogate code point */
+        if ((ret & 0xD800) == 0xD800) {
+            return false;
+        }
         cret = ret;
         r = sr;
         return true;