From 8746d127c04f5bbaf6c6e88cef8606ca5a6a54e9 Mon Sep 17 00:00:00 2001
From: Dimitry Andric <dim@FreeBSD.org>
Date: Thu, 13 Jul 2017 19:25:38 +0000
Subject: Vendor import of clang trunk r307894:
 https://llvm.org/svn/llvm-project/cfe/trunk@307894

---
 lib/Frontend/SerializedDiagnosticReader.cpp | 3 +++
 1 file changed, 3 insertions(+)

(limited to 'lib/Frontend/SerializedDiagnosticReader.cpp')

diff --git a/lib/Frontend/SerializedDiagnosticReader.cpp b/lib/Frontend/SerializedDiagnosticReader.cpp
index 8a8161488f44..08b7087fbad6 100644
--- a/lib/Frontend/SerializedDiagnosticReader.cpp
+++ b/lib/Frontend/SerializedDiagnosticReader.cpp
@@ -27,6 +27,9 @@ std::error_code SerializedDiagnosticReader::readDiagnostics(StringRef File) {
   llvm::BitstreamCursor Stream(**Buffer);
   Optional<llvm::BitstreamBlockInfo> BlockInfo;
 
+  if (Stream.AtEndOfStream())
+    return SDError::InvalidSignature;
+
   // Sniff for the signature.
   if (Stream.Read(8) != 'D' ||
       Stream.Read(8) != 'I' ||
-- 
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