[gnome-shell/wip/carlosg/weak-ref-source: 6/6] st: Keep weak ref on texture cache bound texture source

[Carlos Garnacho <carlosg src gnome org>]

commit 37c50e308001dc6b18686a6b6e999192d6d7cf8e
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Feb 12 23:10:25 2021 +0100

    st: Keep weak ref on texture cache bound texture source
    
    We don't keep any ref on it, so it might leave us with a dangling
    pointer here.
    
    Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/3491

 src/st/st-texture-cache.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)
---
diff --git a/src/st/st-texture-cache.c b/src/st/st-texture-cache.c
index 89620706cb..07b1166a1b 100644
--- a/src/st/st-texture-cache.c
+++ b/src/st/st-texture-cache.c
@@ -798,6 +798,10 @@ st_texture_cache_bind_weak_notify (gpointer     data,
 {
   StTextureCachePropertyBind *bind = data;
   bind->weakref_active = FALSE;
+  if (G_OBJECT (bind->image) != source_location)
+    g_object_weak_unref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
+  if (bind->source != source_location)
+    g_object_weak_unref (G_OBJECT (bind->source), st_texture_cache_bind_weak_notify, bind);
   g_signal_handler_disconnect (bind->source, bind->notify_signal_id);
 }
 
@@ -805,8 +809,13 @@ static void
 st_texture_cache_free_bind (gpointer data)
 {
   StTextureCachePropertyBind *bind = data;
+
   if (bind->weakref_active)
-    g_object_weak_unref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
+    {
+      g_object_weak_unref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
+      g_object_weak_unref (G_OBJECT (bind->source), st_texture_cache_bind_weak_notify, bind);
+    }
+
   g_free (bind);
 }
 
@@ -840,6 +849,7 @@ st_texture_cache_bind_cairo_surface_property (StTextureCache    *cache,
   st_texture_cache_reset_texture (bind, property_name);
 
   g_object_weak_ref (G_OBJECT (bind->image), st_texture_cache_bind_weak_notify, bind);
+  g_object_weak_ref (G_OBJECT (bind->source), st_texture_cache_bind_weak_notify, bind);
   bind->weakref_active = TRUE;
 
   notify_key = g_strdup_printf ("notify::%s", property_name);