From 3920850b705ce06945c823219b0b1221cb0ce694 Mon Sep 17 00:00:00 2001
From: "Duncan P. N. Exon Smith" <dexonsmith@apple.com>
Date: Fri, 21 Mar 2014 20:42:28 +0000
Subject: [PATCH] InstrProf: Actually detect bad headers

<rdar://problem/15950346>

llvm-svn: 204510
---
 include/llvm/ProfileData/InstrProf.h                 |  1 +
 lib/ProfileData/InstrProf.cpp                        |  2 ++
 lib/ProfileData/InstrProfReader.cpp                  | 12 +++++-------
 .../tools/llvm-profdata/raw-magic-but-no-header.test |  6 ++++++
 4 files changed, 14 insertions(+), 7 deletions(-)
 create mode 100644 test/tools/llvm-profdata/raw-magic-but-no-header.test

diff --git a/include/llvm/ProfileData/InstrProf.h b/include/llvm/ProfileData/InstrProf.h
index e2291ef2a9b..d8f3ca6b9d8 100644
--- a/include/llvm/ProfileData/InstrProf.h
+++ b/include/llvm/ProfileData/InstrProf.h
@@ -27,6 +27,7 @@ struct instrprof_error {
     success = 0,
     eof,
     bad_magic,
+    bad_header,
     unsupported_version,
     too_large,
     truncated,
diff --git a/lib/ProfileData/InstrProf.cpp b/lib/ProfileData/InstrProf.cpp
index ecabdd75bdf..850f61354e3 100644
--- a/lib/ProfileData/InstrProf.cpp
+++ b/lib/ProfileData/InstrProf.cpp
@@ -29,6 +29,8 @@ class InstrProfErrorCategoryType : public error_category {
       return "End of File";
     case instrprof_error::bad_magic:
       return "Invalid file format (bad magic)";
+    case instrprof_error::bad_header:
+      return "Invalid header";
     case instrprof_error::unsupported_version:
       return "Unsupported format version";
     case instrprof_error::too_large:
diff --git a/lib/ProfileData/InstrProfReader.cpp b/lib/ProfileData/InstrProfReader.cpp
index c563355599f..d2e5fbd9b9a 100644
--- a/lib/ProfileData/InstrProfReader.cpp
+++ b/lib/ProfileData/InstrProfReader.cpp
@@ -43,8 +43,7 @@ error_code InstrProfReader::create(std::string Path,
 
   if (Buffer->getBufferSize() < sizeof(uint64_t)) {
     Result.reset(new TextInstrProfReader(Buffer));
-    Result->readHeader();
-    return instrprof_error::success;
+    return Result->readHeader();
   }
 
   uint64_t Magic = *(uint64_t *)Buffer->getBufferStart();
@@ -53,8 +52,7 @@ error_code InstrProfReader::create(std::string Path,
     Result.reset(new RawInstrProfReader(Buffer));
   else
     Result.reset(new TextInstrProfReader(Buffer));
-  Result->readHeader();
-  return instrprof_error::success;
+  return Result->readHeader();
 }
 
 void InstrProfIterator::Increment() {
@@ -113,13 +111,13 @@ RawInstrProfReader::RawInstrProfReader(std::unique_ptr<MemoryBuffer> &DataBuffer
 
 error_code RawInstrProfReader::readHeader() {
   if (DataBuffer->getBufferSize() < sizeof(RawHeader))
-    return error(instrprof_error::malformed);
+    return error(instrprof_error::bad_header);
   const RawHeader *Header = (RawHeader *)DataBuffer->getBufferStart();
   if (Header->Magic == getRawMagic())
     ShouldSwapBytes = false;
   else {
     if (sys::SwapByteOrder(Header->Magic) != getRawMagic())
-      return error(instrprof_error::malformed);
+      return error(instrprof_error::bad_magic);
 
     ShouldSwapBytes = true;
   }
@@ -142,7 +140,7 @@ error_code RawInstrProfReader::readHeader(const RawHeader &Header) {
   size_t FileSize = NamesOffset + sizeof(char) * NamesSize;
 
   if (FileSize != DataBuffer->getBufferSize())
-    return error(instrprof_error::malformed);
+    return error(instrprof_error::bad_header);
 
   Data = (ProfileData *)(DataBuffer->getBufferStart() + DataOffset);
   DataEnd = Data + DataSize;
diff --git a/test/tools/llvm-profdata/raw-magic-but-no-header.test b/test/tools/llvm-profdata/raw-magic-but-no-header.test
new file mode 100644
index 00000000000..e899ece2755
--- /dev/null
+++ b/test/tools/llvm-profdata/raw-magic-but-no-header.test
@@ -0,0 +1,6 @@
+RUN: printf "warforpl" > %t
+RUN: not llvm-profdata show %t 2>&1 | FileCheck %s
+RUN: printf "lprofraw" > %t
+RUN: not llvm-profdata show %t 2>&1 | FileCheck %s
+
+CHECK: error: {{.+}}: Invalid header