timed-revealer: Don't release reference we don't own

VirtViewerTimedRevealer::evBox is created in
virt_viewer_timed_revealer_new() and will be passed to
gtk_container_add() through gtk_overlay_add_overlay(overlay,
virt_viewer_timed_revealer_get_overlay_widget(priv->revealer))

This means VirtViewerTimedRevealer does not own a reference on evBox,
and that it should not try to release it in
VirtViewerTimedRevealer::dispose()

Backtrace for the crash:
 #0  0x00007ffff3e92c9d in g_type_check_instance_is_fundamentally_a () at /lib64/libgobject-2.0.so.0
 #1  0x00007ffff3e722a5 in g_object_unref () at /lib64/libgobject-2.0.so.0
 #2  0x000000000041ebe3 in virt_viewer_timed_revealer_dispose (object=0x1127320) at virt-viewer-timed-revealer.c:128
 #3  0x00007ffff3e723b6 in g_object_unref () at  /lib64/libgobject-2.0.so.0
 #4  0x000000000041c040 in virt_viewer_window_dispose  (object=0x981f70) at virt-viewer-window.c:191
 #5  0x00007ffff3e723b6 in g_object_unref () at  /lib64/libgobject-2.0.so.0
 #6  0x0000000000413a58 in virt_viewer_app_display_removed (nth=<optimized out>, self=0x680330) at virt-viewer-app.c:989
 #7  0x0000000000413a58 in virt_viewer_app_display_removed (session=<optimized out>, display=<optimized out>, self=0x680330) at virt-viewer-app.c:1000
 #8  0x00007ffff3e705e0 in g_cclosure_marshal_VOID__OBJECTv () at /lib64/libgobject-2.0.so.0  #9  0x00007ffff3e6d784 in _g_closure_invoke_va () at  /lib64/libgobject-2.0.so.0
 #10 0x00007ffff3e88cd9 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0
 #11 0x00007ffff3e897eb in g_signal_emit_by_name () at /lib64/libgobject-2.0.so.0
 #12 0x0000000000418973 in virt_viewer_session_remove_display (session=0x9c6de0, display=0x961a90) at virt-viewer-session.c:463
 #13 0x0000000000420934 in destroy_display (data=<optimized out>) at virt-viewer-session-spice.c:851
 #14 0x00007ffff3b6d0eb in g_ptr_array_foreach () at /lib64/libglib-2.0.so.0
 #15 0x00007ffff3b6d180 in ptr_array_free () at /lib64/libglib-2.0.so.0
 #16 0x000000000042072a in virt_viewer_session_spice_clear_displays (self=0x9c6de0) at virt-viewer-session-spice.c:94
 #17 0x000000000042240d in virt_viewer_session_spice_close (session=<optimized out>) at virt-viewer-session-spice.c:459
 #18 0x0000000000414be5 in virt_viewer_app_quit (self=self@entry=0x680330) at virt-viewer-app.c:285
 #19 0x0000000000415500 in virt_viewer_app_maybe_quit (self=0x680330, window=window@entry=0x981a90) at virt-viewer-app.c:481
 #20 0x000000000041c4ad in virt_viewer_window_delete (src=<optimized out>, dummy=<optimized out>, self=0x981a90) at virt-viewer-window.c:771
 #21 0x00007ffff61807f1 in _gtk_marshal_BOOLEAN__BOXEDv () at /lib64/libgtk-3.so.0
 #22 0x00007ffff3e6d784 in _g_closure_invoke_va () at /lib64/libgobject-2.0.so.0
 #23 0x00007ffff3e887b3 in g_signal_emit_valist () at /lib64/libgobject-2.0.so.0
 #24 0x00007ffff3e8933f in g_signal_emit () at /lib64/libgobject-2.0.so.0
 #25 0x00007ffff62dde6c in gtk_widget_event_internal () at /lib64/libgtk-3.so.0
 #26 0x00007ffff617f5ef in gtk_main_do_event () at /lib64/libgtk-3.so.0
 #27 0x00007ffff5c7dd25 in _gdk_event_emit () at /lib64/libgdk-3.so.0
 #28 0x00007ffff5cae672 in gdk_event_source_dispatch () at /lib64/libgdk-3.so.0
 #29 0x00007ffff3b9895a in g_main_context_dispatch () at /lib64/libglib-2.0.so.0
 #30 0x00007ffff3b98d10 in g_main_context_iterate.isra () at /lib64/libglib-2.0.so.0
 #31 0x00007ffff3b98dbc in g_main_context_iteration () at /lib64/libglib-2.0.so.0
 #32 0x00007ffff41643cd in g_application_run () at /lib64/libgio-2.0.so.0
 #33 0x000000000040fc1a in main (argc=3, argv=0x7fffffffdec8) at virt-viewer-main.c:41

Signed-off-by: Christophe Fergeau <cfergeau@redhat.com>
Acked-by: Fabiano Fidêncio <fidencio@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/virt-viewer-timed-revealer.c b/src/virt-viewer-timed-revealer.c
index cad9ede..61b2d20 100644
--- a/src/virt-viewer-timed-revealer.c
+++ b/src/virt-viewer-timed-revealer.c
@@ -125,7 +125,7 @@ virt_viewer_timed_revealer_dispose(GObject *object)
     VirtViewerTimedRevealer *self = VIRT_VIEWER_TIMED_REVEALER(object);
     VirtViewerTimedRevealerPrivate *priv = self->priv;
 
-    g_clear_object(&priv->evBox);
+    priv->evBox = NULL;
     priv->revealer = NULL;
 
     if (priv->timeout_id) {