From 13cc38946d570a43c1a913b8fb014c189e660ceb Mon Sep 17 00:00:00 2001
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 2 Nov 2012 09:37:27 +0100
Subject: [PATCH] spice: fix initialization order

Register displaychangelistener last, after spice is fully initialized,
otherwise we may hit NULL pointer dereferences when qemu starts calling
our callbacks.

Commit e250d949feb1334828f27f0d145c35f29c4b7639 triggers this bug.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
 hw/qxl.c           | 10 ++++++++--
 ui/spice-display.c |  2 +-
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/hw/qxl.c b/hw/qxl.c
index f88829c..9418ecb 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -2061,6 +2061,7 @@ static int qxl_init_primary(PCIDevice *dev)
     PCIQXLDevice *qxl = DO_UPCAST(PCIQXLDevice, pci, dev);
     VGACommonState *vga = &qxl->vga;
     PortioList *qxl_vga_port_list = g_new(PortioList, 1);
+    int rc;
 
     qxl->id = 0;
     qxl_init_ramsize(qxl);
@@ -2075,9 +2076,14 @@ static int qxl_init_primary(PCIDevice *dev)
     qemu_spice_display_init_common(&qxl->ssd, vga->ds);
 
     qxl0 = qxl;
-    register_displaychangelistener(vga->ds, &display_listener);
 
-    return qxl_init_common(qxl);
+    rc = qxl_init_common(qxl);
+    if (rc != 0) {
+        return rc;
+    }
+
+    register_displaychangelistener(vga->ds, &display_listener);
+    return rc;
 }
 
 static int qxl_init_secondary(PCIDevice *dev)
diff --git a/ui/spice-display.c b/ui/spice-display.c
index d062765..4c24c32 100644
--- a/ui/spice-display.c
+++ b/ui/spice-display.c
@@ -617,7 +617,6 @@ void qemu_spice_display_init(DisplayState *ds)
 {
     assert(sdpy.ds == NULL);
     qemu_spice_display_init_common(&sdpy, ds);
-    register_displaychangelistener(ds, &display_listener);
 
     sdpy.qxl.base.sif = &dpy_interface.base;
     qemu_spice_add_interface(&sdpy.qxl.base);
@@ -626,4 +625,5 @@ void qemu_spice_display_init(DisplayState *ds)
     qemu_add_vm_change_state_handler(qemu_spice_vm_change_state_handler, &sdpy);
     qemu_spice_create_host_memslot(&sdpy);
     qemu_spice_create_host_primary(&sdpy);
+    register_displaychangelistener(ds, &display_listener);
 }