From f2e68f1d3124ef0f965bdf8505b6fb9c48ac36e6 Mon Sep 17 00:00:00 2001
From: akharlamov <akharlamov@google.com>
Date: Mon, 12 Nov 2018 16:11:10 -0800
Subject: [PATCH] Fix crashes when $HOME is not set

In case HOME environment variable hasn't been set, getenv returns
NULL, which leads to a crash.
---
 renderdoc/driver/vulkan/vk_posix.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/renderdoc/driver/vulkan/vk_posix.cpp b/renderdoc/driver/vulkan/vk_posix.cpp
index 2d839bbde..f5404a48c 100644
--- a/renderdoc/driver/vulkan/vk_posix.cpp
+++ b/renderdoc/driver/vulkan/vk_posix.cpp
@@ -301,7 +301,8 @@ string LayerRegistrationPath(LayerPath path)
       if(xdg && FileIO::exists(xdg))
         return string(xdg) + "/vulkan/implicit_layer.d/renderdoc_capture.json";
 
-      return string(getenv("HOME")) +
+      const char *home_path = getenv("HOME");
+      return string(home_path != NULL ? home_path : "") +
              "/.local/share/vulkan/implicit_layer.d/renderdoc_capture.json";
     }
     default: break;
@@ -330,7 +331,10 @@ bool VulkanReplay::CheckVulkanLayer(VulkanLayerFlags &flags, std::vector<std::st
 {
   // see if the user has suppressed all this checking as a "I know what I'm doing" measure
 
-  if(FileExists(string(getenv("HOME")) + "/.renderdoc/ignore_vulkan_layer_issues"))
+  const char *home_path = getenv("HOME");
+  if(home_path == NULL)
+    home_path = "";
+  if(FileExists(string(home_path) + "/.renderdoc/ignore_vulkan_layer_issues"))
   {
     flags = VulkanLayerFlags::ThisInstallRegistered;
     return false;