[Xen-devel] [PATCH 04 of 14] When passing no bitmap for the shadow log dirty bitmap clean up, we should not get EFAULT

[Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>]

 tools/libxc/xc_domain.c |  2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)


This is due to a stale check for guest_handle_null in the hypervisor, which 
doesn't
necessarily work with the hypercall buffers.

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>

diff -r 58eae300fa63 -r 93066bdc1e1c tools/libxc/xc_domain.c
--- a/tools/libxc/xc_domain.c
+++ b/tools/libxc/xc_domain.c
@@ -430,6 +430,8 @@ int xc_shadow_control(xc_interface *xch,
     DECLARE_DOMCTL;
     DECLARE_HYPERCALL_BUFFER_ARGUMENT(dirty_bitmap);
 
+    memset(&domctl, 0, sizeof(domctl));
+
     domctl.cmd = XEN_DOMCTL_shadow_op;
     domctl.domain = (domid_t)domid;
     domctl.u.shadow_op.op     = sop;

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