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Commit 660696d1 authored by Gleb Natapov's avatar Gleb Natapov
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KVM: X86 emulator: fix source operand decoding for 8bit mov[zs]x instructions 



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

Cc: stable@vger.kernel.org
Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
parent d1fa0352

arch/x86/kvm/emulate.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -4172,6 +4172,10 @@ static int decode_operand(struct x86_emulate_ctxt *ctxt, struct operand *op, 
		break;

		break;

	case OpMem8:

	case OpMem8:

		ctxt->memop.bytes = 1;

		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;

		goto mem_common;

	case OpMem16:

	case OpMem16:

		ctxt->memop.bytes = 2;

		ctxt->memop.bytes = 2;