From c000e9c1f409c926b766333c615c321eab82e366 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ivan=20Schre=CC=81ter?= <ivan.schreter@sap.com>
Date: Fri, 24 Feb 2023 21:51:46 +0100
Subject: [PATCH] Add NUL character at the end of copied error message

C++ error message returned by `what` must be NUL-terminated. However,
the current copy function only copied the characters, but didn't add
the NUL. Allocate one more byte and set it to NUL.
---
 src/cxx.cc | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/cxx.cc b/src/cxx.cc
index 4958eb08b..d449429da 100644
--- a/src/cxx.cc
+++ b/src/cxx.cc
@@ -449,8 +449,9 @@ static_assert(!std::is_same<Vec<std::uint8_t>::const_iterator,
               "Vec<T>::const_iterator != Vec<T>::iterator");
 
 static const char *errorCopy(const char *ptr, std::size_t len) {
-  char *copy = new char[len];
+  char *copy = new char[len + 1];
   std::memcpy(copy, ptr, len);
+  copy[len] = 0;
   return copy;
 }