[X86] There are only 8 mask registers. Fail disassembly if instruction tries to reference more.

llvm-svn: 230931
2015-03-02 03:33:11 +00:00 · 2015-03-02 03:33:11 +00:00 · 9c26bcca5a
parent e2c9e64532
commit 9c26bcca5a
1 changed files with 2 additions and 0 deletions
--- 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);                \