spapr: Initialize reserved areas list in FDT in H_CAS handler

At the moment the device tree produced by the H_CAS handler has no
reserved map initialized at all which is not correct as at least one
empty record is required to be present as a marker of the end.
This does not cause problems now as the only consumer is SLOF which
does not look at the reserved map area.

However when DTC's "Improve libfdt's memory safety" changeset hits
the QEMU upstream, there will be errors reported and crashes observed.

This fixes the problem by adding an empty entry to the reserved map,
just like create_device_tree() does already.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
index 2c0be8c8980413a27e4196595973761c58af1f95..a81570e7c8b15f07c99afb5b299e803c1919f13e 100644 (file)
--- a/hw/ppc/spapr.c
+++ b/hw/ppc/spapr.c
@@ -865,6 +865,7 @@ int spapr_h_cas_compose_response(sPAPRMachineState *spapr,
     /* Create skeleton */
     fdt_skel = g_malloc0(size);
     _FDT((fdt_create(fdt_skel, size)));
+    _FDT((fdt_finish_reservemap(fdt_skel)));
     _FDT((fdt_begin_node(fdt_skel, "")));
     _FDT((fdt_end_node(fdt_skel)));
     _FDT((fdt_finish(fdt_skel)));