From c48edbb2fd4b7196b8bc67e7e450553602b5a754 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 9 Sep 2009 01:45:24 +0000
Subject: [PATCH] Make sure the memory range is writable before memset'ing it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81308 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/Allocator.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Support/Allocator.cpp b/lib/Support/Allocator.cpp
index 36da4432073..7a3fd87c17e 100644
--- a/lib/Support/Allocator.cpp
+++ b/lib/Support/Allocator.cpp
@@ -15,6 +15,7 @@
 #include "llvm/Support/DataTypes.h"
 #include "llvm/Support/Recycler.h"
 #include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Memory.h"
 #include <cstring>
 
 namespace llvm {
@@ -60,6 +61,7 @@ void BumpPtrAllocator::DeallocateSlabs(MemSlab *Slab) {
 #ifndef NDEBUG
     // Poison the memory so stale pointers crash sooner.  Note we must
     // preserve the Size and NextPtr fields at the beginning.
+    sys::Memory::setRangeWritable(Slab + 1, Slab->Size - sizeof(MemSlab));
     memset(Slab + 1, 0xCD, Slab->Size - sizeof(MemSlab));
 #endif
     Allocator.Deallocate(Slab);