From 92a4322f3a6f13e9ee321d2607ac5690d53e6512 Mon Sep 17 00:00:00 2001
From: Jason Volk <jason@zemos.net>
Date: Mon, 18 May 2020 17:56:28 -0700
Subject: [PATCH] ircd::json: Assertions on iterator increments.

---
 ircd/json.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ircd/json.cc b/ircd/json.cc
index 830a13e2f..962c9e66f 100644
--- a/ircd/json.cc
+++ b/ircd/json.cc
@@ -2401,7 +2401,6 @@ ircd::json::vector::const_iterator &
 ircd::json::vector::const_iterator::operator++()
 try
 {
-
 	this->state = {};
 	string_view &state(this->state);
 	qi::parse(start, stop, vector_next_parse, state);
@@ -2687,6 +2686,8 @@ ircd::json::object::const_iterator &
 ircd::json::object::const_iterator::operator++()
 try
 {
+	assert(start != stop);
+
 	state = {};
 	qi::parse(start, stop, object_next_parse, state);
 	return *this;
@@ -3057,6 +3058,8 @@ ircd::json::array::const_iterator &
 ircd::json::array::const_iterator::operator++()
 try
 {
+	assert(start != stop);
+
 	state = string_view{};
 	qi::parse(start, stop, array_next_parse, state);
 	return *this;