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From c212cb8f32c02cf2fe691372b753d334f6e25d69 Mon Sep 17 00:00:00 2001
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From: Marek Kasik <mkasik@redhat.com>
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Date: Mon, 16 Dec 2013 18:04:14 +0100
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Subject: [PATCH 1/2] gdkwindow: Handle references in "update_windows" list
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correctly
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Since update_windows list is a static variable in GdkWindow.c which
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contains pointers to windows which needs to be updated, it can happen
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that it contains a pointer to a window even after quit from a gtk_main().
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If another gtk_main() is called in the same process it tries to process
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windows in the list which leads to a crash.
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Correct reference count handling of added windows prevents such applications
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from crash.
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https://bugzilla.gnome.org/show_bug.cgi?id=711552
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---
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gdk/gdkwindow.c | 19 ++++++++++++-------
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1 file changed, 12 insertions(+), 7 deletions(-)
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diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
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index f5f0339..0f33fb0 100644
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--- a/gdk/gdkwindow.c
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+++ b/gdk/gdkwindow.c
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@@ -5267,7 +5267,7 @@ gdk_window_add_update_window (GdkWindow *window)
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prev = tmp;
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}
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/* here, tmp got advanced past all lower stacked siblings */
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- tmp = g_slist_prepend (tmp, window);
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+ tmp = g_slist_prepend (tmp, g_object_ref (window));
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if (prev)
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prev->next = tmp;
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else
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@@ -5280,7 +5280,7 @@ gdk_window_add_update_window (GdkWindow *window)
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*/
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if (has_ancestor_in_list && gdk_window_is_ancestor (tmp->data, window))
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{
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- tmp = g_slist_prepend (tmp, window);
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+ tmp = g_slist_prepend (tmp, g_object_ref (window));
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if (prev)
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prev->next = tmp;
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@@ -5294,7 +5294,7 @@ gdk_window_add_update_window (GdkWindow *window)
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*/
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if (! tmp->next && has_ancestor_in_list)
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{
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- tmp = g_slist_append (tmp, window);
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+ tmp = g_slist_append (tmp, g_object_ref (window));
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return;
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}
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@@ -5305,13 +5305,20 @@ gdk_window_add_update_window (GdkWindow *window)
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* hierarchy than what is already in the list) or the list is
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* empty, prepend
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*/
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- update_windows = g_slist_prepend (update_windows, window);
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+ update_windows = g_slist_prepend (update_windows, g_object_ref (window));
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}
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static void
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gdk_window_remove_update_window (GdkWindow *window)
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{
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- update_windows = g_slist_remove (update_windows, window);
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+ GSList *link;
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+
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+ link = g_slist_find (update_windows, window);
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+ if (link != NULL)
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+ {
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+ update_windows = g_slist_delete_link (update_windows, link);
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+ g_object_unref (window);
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+ }
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}
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static gboolean
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@@ -5687,8 +5694,6 @@ gdk_window_process_all_updates (void)
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_gdk_windowing_before_process_all_updates ();
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- g_slist_foreach (old_update_windows, (GFunc)g_object_ref, NULL);
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-
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while (tmp_list)
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{
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GdkWindowObject *private = (GdkWindowObject *)tmp_list->data;
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--
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1.8.4.2
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