From 9812fc9574600d47019fc64ee50b4113343aec91 Mon Sep 17 00:00:00 2001
From: Andrew Tridgell <andrew@tridgell.net>
Date: Mon, 8 Jan 2018 15:33:08 +1100
Subject: [PATCH] HAL_Chibios: prevent creation of i2c devices on invalid bus

---
 libraries/AP_HAL_ChibiOS/I2CDevice.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/libraries/AP_HAL_ChibiOS/I2CDevice.cpp b/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
index f91d617fb2..69e4dbe4d9 100644
--- a/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
+++ b/libraries/AP_HAL_ChibiOS/I2CDevice.cpp
@@ -190,6 +190,9 @@ bool I2CDevice::adjust_periodic_callback(AP_HAL::Device::PeriodicHandle h, uint3
 AP_HAL::OwnPtr<AP_HAL::I2CDevice>
 I2CDeviceManager::get_device(uint8_t bus, uint8_t address)
 {
+    if (bus >= ARRAY_SIZE(I2CD)) {
+        return AP_HAL::OwnPtr<AP_HAL::I2CDevice>(nullptr);
+    }
     auto dev = AP_HAL::OwnPtr<AP_HAL::I2CDevice>(new I2CDevice(bus, address));
     return dev;
 }