From 19330f45d3d0efbf490a436c8689f30c4fc79e44 Mon Sep 17 00:00:00 2001
From: bunnei <bunneidev@gmail.com>
Date: Sat, 9 Mar 2019 14:36:52 -0500
Subject: [PATCH] maxwell_dma: Check for valid source in destination before
 copy.

- Avoid a crash in Octopath Traveler.
---
 src/video_core/engines/maxwell_dma.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/video_core/engines/maxwell_dma.cpp b/src/video_core/engines/maxwell_dma.cpp
index a0ded4c25..5cca5c29a 100644
--- a/src/video_core/engines/maxwell_dma.cpp
+++ b/src/video_core/engines/maxwell_dma.cpp
@@ -88,6 +88,16 @@ void MaxwellDMA::HandleCopy() {
     auto source_ptr{memory_manager.GetPointer(source)};
     auto dst_ptr{memory_manager.GetPointer(dest)};
 
+    if (!source_ptr) {
+        LOG_ERROR(HW_GPU, "source_ptr is invalid");
+        return;
+    }
+
+    if (!dst_ptr) {
+        LOG_ERROR(HW_GPU, "dst_ptr is invalid");
+        return;
+    }
+
     const auto FlushAndInvalidate = [&](u32 src_size, u64 dst_size) {
         // TODO(Subv): For now, manually flush the regions until we implement GPU-accelerated
         // copying.