From e13d6da81fbb3aa8d45e6776fd3d8b388cb6fb61 Mon Sep 17 00:00:00 2001
From: Ted John <ted@brambles.org>
Date: Mon, 10 Dec 2018 19:54:54 +0000
Subject: [PATCH] Prevent possible stack overflow if zoom offset is 0

---
 src/openrct2/object/ObjectJsonHelpers.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/openrct2/object/ObjectJsonHelpers.cpp b/src/openrct2/object/ObjectJsonHelpers.cpp
index 4dc75528df..a1d25445f1 100644
--- a/src/openrct2/object/ObjectJsonHelpers.cpp
+++ b/src/openrct2/object/ObjectJsonHelpers.cpp
@@ -69,7 +69,7 @@ namespace ObjectJsonHelpers
                 g1 = *orig;
                 g1.offset = (uint8_t*)std::malloc(length);
                 std::memcpy(g1.offset, orig->offset, length);
-                if (g1.flags & G1_FLAG_HAS_ZOOM_SPRITE)
+                if ((g1.flags & G1_FLAG_HAS_ZOOM_SPRITE) && g1.zoomed_offset != 0)
                 {
                     // Fetch image for next zoom level
                     next_zoom = std::make_unique<RequiredImage>((uint32_t)(idx - g1.zoomed_offset), getter);