From 9c26bcca5a09c226ec0d702e8e644ad71188d298 Mon Sep 17 00:00:00 2001
From: Craig Topper <craig.topper@gmail.com>
Date: Mon, 2 Mar 2015 03:33:11 +0000
Subject: [PATCH] [X86] There are only 8 mask registers. Fail disassembly if
 instruction tries to reference more.

llvm-svn: 230931
---
 llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp
index 619a0d4..49e6403 100644
--- a/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp
+++ b/llvm/lib/Target/X86/Disassembler/X86DisassemblerDecoder.cpp
@@ -1458,6 +1458,8 @@ static int readModRM(struct InternalInstruction* insn) {
     case TYPE_VK1:                                        \
     case TYPE_VK8:                                        \
     case TYPE_VK16:                                       \
+      if (index > 7)                                      \
+        *valid = 0;                                       \
       return prefix##_K0 + index;                         \
     case TYPE_MM64:                                       \
       return prefix##_MM0 + (index & 0x7);                \
-- 
2.7.4