commit d2b2bfed9465847baa82a314d4da161b368395bb
author Zachary Turner <zturner@google.com> Wed Jun 08 00:25:08 2016 +0000
committer Zachary Turner <zturner@google.com> Wed Jun 08 00:25:08 2016 +0000
tree a394e7cbf39161112109b311381b2afc0e14de4c
parent a483eae2ff21d238ba3a872ef72ec7943acaefa2

[pdb] Try to fix use after free.

llvm-svn: 272078

llvm/lib/DebugInfo/PDB/Raw/TpiStream.cpp

diff --git a/llvm/lib/DebugInfo/PDB/Raw/TpiStream.cpp b/llvm/lib/DebugInfo/PDB/Raw/TpiStream.cpp
index 386f8ac..f34a513 100644
--- a/llvm/lib/DebugInfo/PDB/Raw/TpiStream.cpp
+++ b/llvm/lib/DebugInfo/PDB/Raw/TpiStream.cpp
@@ -104,6 +104,10 @@
     return EC;
 
   // Hash indices, hash values, etc come from the hash stream.
+  if (Header->HashStreamIndex >= Pdb.getNumStreams())
+    return make_error<RawError>(raw_error_code::corrupt_file,
+                                "Invalid TPI hash stream index.");
+
   HashStream.reset(new MappedBlockStream(
       llvm::make_unique<IndexedStreamData>(Header->HashStreamIndex, Pdb), Pdb));
   codeview::StreamReader HSR(*HashStream);