Verify sizes when trying to read a VBR

Also added an assert to ReadVBR64. llvm-svn: 234984
2015-04-15 08:48:08 +00:00
parent c640ff63e2
commit 7dc896fcce
4 changed files with 8 additions and 0 deletions
--- a/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
+++ b/llvm/lib/Bitcode/Reader/BitstreamReader.cpp
@@ -62,6 +62,8 @@ static uint64_t readAbbreviatedField(BitstreamCursor &Cursor,
  case BitCodeAbbrevOp::Fixed:
    return Cursor.Read((unsigned)Op.getEncodingData());
  case BitCodeAbbrevOp::VBR:
+    if ((unsigned)Op.getEncodingData() > 64)
+      report_fatal_error("Invalid record");
    return Cursor.ReadVBR64((unsigned)Op.getEncodingData());
  case BitCodeAbbrevOp::Char6:
    return BitCodeAbbrevOp::DecodeChar6(Cursor.Read(6));