ui/gtk: fix crash at startup when no console is available

This patch fixes a segfault at QEMU startup, introduced in a08156321ab9a7d2fed9ee77dbfeea2a61ffd153.
gd_vc_find_current() return NULL, which is dereferenced without checking it.

While at it, disable the whole 'View' menu if no console exists.

Reproducer: qemu-system-i386 -M none -nodefaults

Signed-off-by: Hervé Poussineau <hpoussin@reactos.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 1483263585-8101-1-git-send-email-hpoussin@reactos.org
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
(cherry picked from commit 3d4da9d6f3b664beb5bee446ad53b69178f46ad4)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/ui/gtk.c b/ui/gtk.c
index a216216d8b..406de4f940 100644
--- a/ui/gtk.c
+++ b/ui/gtk.c
@@ -2171,6 +2171,8 @@ static gboolean gtkinit;
 
 void gtk_display_init(DisplayState *ds, bool full_screen, bool grab_on_hover)
 {
+    VirtualConsole *vc;
+
     GtkDisplayState *s = g_malloc0(sizeof(*s));
     char *filename;
     GdkDisplay *window_display;
@@ -2249,9 +2251,11 @@ void gtk_display_init(DisplayState *ds, bool full_screen, bool grab_on_hover)
     }
 #endif
 
+    vc = gd_vc_find_current(s);
+    gtk_widget_set_sensitive(s->view_menu, vc != NULL);
 #ifdef CONFIG_VTE
     gtk_widget_set_sensitive(s->copy_item,
-                             gd_vc_find_current(s)->type == GD_VC_VTE);
+                             vc && vc->type == GD_VC_VTE);
 #endif
 
     if (full_screen) {