[ 080/136 ] KVM: X86 emulator: fix source operand decoding for 8bit mov[zs]xinstructions

[Steven Rostedt]

3.6.11.4 stable review patch.
If anyone has any objections, please let me know.

------------------

From: Gleb Natapov <gleb@xxxxxxxxxx>

[ Upstream commit 660696d1d16a71e15549ce1bf74953be1592bcd3 ]

Source operand for one byte mov[zs]x is decoded incorrectly if it is in
high byte register. Fix that.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gleb Natapov <gleb@xxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
 arch/x86/kvm/emulate.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index a3b57a2..2386209 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3970,6 +3970,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op,
 		break;
 	case OpMem8:
 		ctxt->memop.bytes = 1;
+		if (ctxt->memop.type == OP_REG) {
+			ctxt->memop.addr.reg = decode_register(ctxt, ctxt->modrm_rm, 1);
+			fetch_register_operand(&ctxt->memop);
+		}
 		goto mem_common;
 	case OpMem16:
 		ctxt->memop.bytes = 2;
-- 
1.7.10.4


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