From 2bf33017bc9d26c55ae85a7f371f2a60ea28e599 Mon Sep 17 00:00:00 2001
From: Alexis Engelke <alexis.engelke@googlemail.com>
Date: Sun, 3 Nov 2019 11:54:00 +0100
Subject: [PATCH] Reject invalid move to CS

---
 decode.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/decode.c b/decode.c
index 4fc7e08..2c39ae2 100644
--- a/decode.c
+++ b/decode.c
@@ -629,6 +629,9 @@ fd_decode(const uint8_t* buffer, size_t len_sz, int mode_int, uintptr_t address,
         instr->operands[i].misc = reg_type;
     }
 
+    if (instr->type == FDI_MOV_G2S && instr->operands[0].reg == 1)
+        return FD_ERR_UD;
+
     instr->size = off;
 
     return off;