files-view: Handle canceled clipboard update

Correctly handle the cancellation of a clipboard update by checking
the return value of gdk_clipboard_read_value_finish() and returning
early on cancellation.

Fixes: #2868

2 files changed, 23 insertions, 7 deletions

diff --git a/src/nautilus-files-view.c b/src/nautilus-files-view.c
index adce3f519..2d7ae526b 100644
--- a/src/nautilus-files-view.c
+++ b/src/nautilus-files-view.c
@@ -7210,8 +7210,8 @@ update_actions_clipboard_contents_received (GObject      *source_object,
                                             GAsyncResult *res,
                                             gpointer      user_data)
 {
-    NautilusFilesView *view = NAUTILUS_FILES_VIEW (user_data);
-    NautilusFilesViewPrivate *priv = nautilus_files_view_get_instance_private (view);
+    NautilusFilesView *view;
+    NautilusFilesViewPrivate *priv;
     NautilusClipboard *clip = NULL;
     gboolean can_link_from_copied_files;
     gboolean settings_show_create_link;
@@ -7222,8 +7222,15 @@ update_actions_clipboard_contents_received (GObject      *source_object,
     const GValue *value;
 
     value = gdk_clipboard_read_value_finish (GDK_CLIPBOARD (source_object), res, NULL);
+    if (value == NULL)
+    {
+        return;
+    }
 
-    if (value != NULL && G_VALUE_HOLDS (value, NAUTILUS_TYPE_CLIPBOARD))
+    view = NAUTILUS_FILES_VIEW (user_data);
+    priv = nautilus_files_view_get_instance_private (view);
+
+    if (G_VALUE_HOLDS (value, NAUTILUS_TYPE_CLIPBOARD))
     {
         clip = g_value_get_boxed (value);
     }
diff --git a/src/nautilus-list-base.c b/src/nautilus-list-base.c
index 8d16c682e..5a1708c92 100644
--- a/src/nautilus-list-base.c
+++ b/src/nautilus-list-base.c
@@ -1302,15 +1302,24 @@ on_clipboard_contents_received (GObject      *source_object,
                                 GAsyncResult *res,
                                 gpointer      user_data)
 {
-    NautilusFilesView *files_view = NAUTILUS_FILES_VIEW (user_data);
-    NautilusListBase *self = NAUTILUS_LIST_BASE (files_view);
-    NautilusListBasePrivate *priv = nautilus_list_base_get_instance_private (self);
+    NautilusFilesView *files_view;
+    NautilusListBase *self;
+    NautilusListBasePrivate *priv;
     NautilusClipboard *clip;
     NautilusViewItem *item;
     const GValue *value;
 
     value = gdk_clipboard_read_value_finish (GDK_CLIPBOARD (source_object), res, NULL);
 
+    if (value == NULL)
+    {
+        return;
+    }
+
+    files_view = NAUTILUS_FILES_VIEW (user_data);
+    self = NAUTILUS_LIST_BASE (files_view);
+    priv = nautilus_list_base_get_instance_private (self);
+
     for (GList *l = priv->cut_files; l != NULL; l = l->next)
     {
         item = nautilus_view_model_get_item_from_file (priv->model, l->data);
@@ -1321,7 +1330,7 @@ on_clipboard_contents_received (GObject      *source_object,
     }
     g_clear_list (&priv->cut_files, g_object_unref);
 
-    if (value != NULL && G_VALUE_HOLDS (value, NAUTILUS_TYPE_CLIPBOARD))
+    if (G_VALUE_HOLDS (value, NAUTILUS_TYPE_CLIPBOARD))
     {
         clip = g_value_get_boxed (value);
     }