KVM: x86 emulator: fix src, dst value initialization

Some operand fetches are less than the machine word size and can result in
stale bits if used together with operands of different sizes.

Signed-off-by: Nitin A Kamble <nitin.a.kamble@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index cf8db670df7f..7360a71094f5 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -827,6 +827,7 @@ done_prefixes:
               srcmem_common:
                 src.type = OP_MEM;
                 src.ptr = (unsigned long *)cr2;
+                src.val = 0;
                 if ((rc = ops->read_emulated((unsigned long)src.ptr,
                                              &src.val, src.bytes, ctxt->vcpu)) != 0)
                         goto done;
@@ -891,6 +892,7 @@ done_prefixes:
                 dst.type = OP_MEM;
                 dst.ptr = (unsigned long *)cr2;
                 dst.bytes = (d & ByteOp) ? 1 : op_bytes;
+                dst.val = 0;
                 if (d & BitOp) {
                         unsigned long mask = ~(dst.bytes * 8 - 1);