From 39253260b90964141901a7900bec1f0406f02c3d Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 11 May 2007 00:00:27 +0000
Subject: [PATCH] Fix a bug where the bcreader could crash on .bc files that
 were an exact multiple of the page size, due to a bug in MappedFile

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36980 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/System/Unix/MappedFile.inc | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/System/Unix/MappedFile.inc b/lib/System/Unix/MappedFile.inc
index 5e76e2bc26a..91b92ece5a5 100644
--- a/lib/System/Unix/MappedFile.inc
+++ b/lib/System/Unix/MappedFile.inc
@@ -78,6 +78,7 @@ void MappedFile::unmap() {
     if (options_ & WRITE_ACCESS)
       ::msync(base_, info_->Size, MS_SYNC);
     ::munmap(base_, info_->Size);
+    base_ = 0;  // Mark this as non-mapped.
   }
 }