From 6a0c49d05e2d71db068c001da127755bc5d5e7e8 Mon Sep 17 00:00:00 2001
From: Scott Ludwig <scottlu@gmail.com>
Date: Sat, 4 Jun 2016 16:07:01 -0700
Subject: [PATCH] Fix memory overwrite bug in memory manager

Surprising this has been in the code this long.
---
 game/memmgr.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/game/memmgr.cpp b/game/memmgr.cpp
index 6cd6794..07f6f10 100644
--- a/game/memmgr.cpp
+++ b/game/memmgr.cpp
@@ -1041,7 +1041,11 @@ void MemMgr::WriteHeader(Heap *pheap, MemHeader *pmhdrDst, MemHeader *pmhdrSrc,
 		memcpy(pmhdrDst, pmhdrSrc, cb);
 	}
 #else
-	memcpy(pmhdrDst, pmhdrSrc, cb);
+	if (pmhdrSrc + cb <= pmhdrDst || pmhdrDst + cb <= pmhdrSrc) {
+		memcpy(pmhdrDst, pmhdrSrc, cb);
+	} else {
+		memmove(pmhdrDst, pmhdrSrc, cb);
+	}
 #endif
 }