From: Nick Lewycky <nicholas@mxc.ca>
Date: Sun, 1 Jul 2007 03:06:30 +0000 (+0000)
Subject: Fix undefined behaviour reported by the new --enable-expensive-checks option.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ea332946d3577cc75422a1ad0cbce9321e9e8c59;p=oota-llvm.git

Fix undefined behaviour reported by the new --enable-expensive-checks option.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37829 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 0e857021a48..43eb1813ad6 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -251,8 +251,9 @@ MemoryBuffer *MemoryBuffer::getSTDIN() {
   while (size_t ReadBytes = fread(Buffer, 1, 4096*4, stdin))
     FileData.insert(FileData.end(), Buffer, Buffer+ReadBytes);
   
+  FileData.push_back(0); // &FileData[Size] is invalid. So is &*FileData.end().
   size_t Size = FileData.size();
   MemoryBuffer *B = new STDINBufferFile();
-  B->initCopyOf(&FileData[0], &FileData[Size]);
+  B->initCopyOf(&FileData[0], &FileData[Size-1]);
   return B;
 }