From 6f4fefbd771008fe2ea9ce5adb2a1a34a744451e Mon Sep 17 00:00:00 2001
From: andrethomas <andre1024@gmail.com>
Date: Mon, 10 Sep 2018 18:32:41 +0200
Subject: [PATCH] Fix potential buffer overun for EVENT

---
 sonoff/xsns_29_mcp230xx.ino | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sonoff/xsns_29_mcp230xx.ino b/sonoff/xsns_29_mcp230xx.ino
index d6683da44..058d6c25c 100644
--- a/sonoff/xsns_29_mcp230xx.ino
+++ b/sonoff/xsns_29_mcp230xx.ino
@@ -300,7 +300,7 @@ void MCP230xx_CheckForInterrupt(void) {
                     MqttPublishPrefixTopic_P(RESULT_OR_STAT, mqtt_data);
                   }
                   if (int_event) {
-                    char command[18];
+                    char command[19]; // Theoretical max = 'event MCPINT_D16=1' so 18 + 1 (for the \n)
                     sprintf(command,"event MCPINT_D%i=%i",intp+(mcp230xx_port*8),((mcp230xx_intcap >> intp) & 0x01));
                     ExecuteCommand(command, SRC_RULE);
                   }