From 19a4f0988c42679207b9da101d54bc61432cdfb7 Mon Sep 17 00:00:00 2001
From: Daniel Agar <daniel@agar.ca>
Date: Sat, 24 Mar 2018 12:55:18 -0400
Subject: [PATCH] gyrosim fix transfer hardcoded buffer index

 - fixes coverity CID 196758
---
 src/platforms/posix/drivers/gyrosim/gyrosim.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/platforms/posix/drivers/gyrosim/gyrosim.cpp b/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
index d9449116db..3722b1532d 100644
--- a/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
+++ b/src/platforms/posix/drivers/gyrosim/gyrosim.cpp
@@ -506,8 +506,11 @@ GYROSIM::transfer(uint8_t *send, uint8_t *recv, unsigned len)
 
 		// FIXME - not sure what interrupt status should be
 		recv[1] = 0;
+
 		// skip cmd and status bytes
-		sim->getMPUReport(&recv[2], len - 2);
+		if (len > 2) {
+			sim->getMPUReport(&recv[2], len - 2);
+		}
 
 	} else if (cmd & DIR_READ) {
 		PX4_DEBUG("Reading %u bytes from register %u", len - 1, reg);