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authorGleb Natapov <gleb@redhat.com>2013-04-24 13:38:36 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-07 20:08:24 -0700
commitb63018273bb6c505777a7ddccb8120f08111a6c0 (patch)
treeca450012b8ff9d2d5354bbbd08fd0c5449f0c936
parent3b9e9dd0f30c73bb90175124ed33b52d59d79c16 (diff)
downloadvexpress-lsk-b63018273bb6c505777a7ddccb8120f08111a6c0.tar.gz
KVM: X86 emulator: fix source operand decoding for 8bit mov[zs]x instructions
commit 660696d1d16a71e15549ce1bf74953be1592bcd3 upstream. Source operand for one byte mov[zs]x is decoded incorrectly if it is in high byte register. Fix that. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kvm/emulate.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index a27e7637110..d330b3c619f 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4030,6 +4030,10 @@ 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;