From 69f7fcae82d6a57439da6286f37a67c983838abc Mon Sep 17 00:00:00 2001
From: "Roger A. Light" <roger@atchoo.org>
Date: Wed, 25 Nov 2020 16:57:33 +0000
Subject: [PATCH] Support cJSON < 1.7.13.

---
 config.h                          | 5 +++++
 plugins/dynamic-security/plugin.c | 9 ++++++++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/config.h b/config.h
index 42658599..77da39df 100644
--- a/config.h
+++ b/config.h
@@ -73,4 +73,9 @@
 #  define HAVE_PTHREAD_CANCEL
 #endif
 
+#ifdef WITH_CJSON
+#  include <cJSON.h>
+#  define CJSON_VERSION_FULL (CJSON_VERSION_MAJOR*1000000+CJSON_VERSION_MINOR*1000+CJSON_VERSION_PATCH)
+#endif
+
 #endif
diff --git a/plugins/dynamic-security/plugin.c b/plugins/dynamic-security/plugin.c
index a95c23dc..a011c100 100644
--- a/plugins/dynamic-security/plugin.c
+++ b/plugins/dynamic-security/plugin.c
@@ -93,8 +93,15 @@ static int dynsec_control_callback(int event, void *event_data, void *userdata)
 	cJSON_AddItemToObject(j_response_tree, "responses", j_responses);
 
 
-	/* Parse cJSON tree */
+	/* Parse cJSON tree.
+	 * Using cJSON_ParseWithLength() is the best choice here, but Mosquitto
+	 * always adds an extra 0 to the end of the payload memory, so using
+	 * cJSON_Parse() on its own will still not overrun. */
+#if CJSON_VERSION_FULL < 1007013
+	tree = cJSON_Parse(ed->payload);
+#else
 	tree = cJSON_ParseWithLength(ed->payload, ed->payloadlen);
+#endif
 	if(tree == NULL){
 		dynsec__command_reply(j_responses, ed->client, "Unknown command", "Payload not valid JSON", NULL);
 		send_response(j_response_tree);