From b9153bacd05f4e31f8d841a54ee035abea5b3f41 Mon Sep 17 00:00:00 2001
From: Argyrios Kyrtzidis <akyrtzi@gmail.com>
Date: Tue, 13 Mar 2012 20:18:42 +0000
Subject: [PATCH] Add a sanity check in MemoryBuffer::getOpenFile() to make
 sure we don't hang if the passed in FileSize is inaccurate.

rdar://11034179

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152662 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Support/MemoryBuffer.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lib/Support/MemoryBuffer.cpp b/lib/Support/MemoryBuffer.cpp
index 4b15587db7a..911a03f8088 100644
--- a/lib/Support/MemoryBuffer.cpp
+++ b/lib/Support/MemoryBuffer.cpp
@@ -336,7 +336,11 @@ error_code MemoryBuffer::getOpenFile(int FD, const char *Filename,
       // Error while reading.
       return error_code(errno, posix_category());
     }
-    assert(NumRead != 0 && "fstat reported an invalid file size.");
+    if (NumRead == 0) {
+      assert(0 && "We got inaccurate FileSize value or fstat reported an "
+                   "invalid file size.");
+      break;
+    }
     BytesLeft -= NumRead;
     BufPtr += NumRead;
   }
-- 
2.34.1