From cdce598c35bcd61fbeb2098b25474964e889de0d Mon Sep 17 00:00:00 2001
From: Andrew Meadows <andrew@highfidelity.io>
Date: Fri, 15 Jun 2018 14:49:07 -0700
Subject: [PATCH] protect against misuse of Sysmem::setSubData()

---
 libraries/gpu/src/gpu/Sysmem.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/gpu/src/gpu/Sysmem.cpp b/libraries/gpu/src/gpu/Sysmem.cpp
index a642d40478..d942c3fd27 100644
--- a/libraries/gpu/src/gpu/Sysmem.cpp
+++ b/libraries/gpu/src/gpu/Sysmem.cpp
@@ -124,7 +124,7 @@ Size Sysmem::setData( Size size, const Byte* bytes ) {
 }
 
 Size Sysmem::setSubData( Size offset, Size size, const Byte* bytes) {
-    if (size && ((offset + size) <= getSize()) && bytes) {
+    if (_data && size && ((offset + size) <= getSize()) && bytes) {
         memcpy( _data + offset, bytes, size );
         return size;
     }