gnome-shell/SOURCES/0001-st-bin-Disallow-st_bin_set_child-with-already-parent.patch

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2023-05-16 06:08:25 +00:00
From 96404287bc4269dea7b037e7b178e54ebf616d47 Mon Sep 17 00:00:00 2001
From: Daniel van Vugt <daniel.van.vugt@canonical.com>
Date: Tue, 24 Nov 2020 17:34:08 +0800
Subject: [PATCH] st-bin: Disallow st_bin_set_child with already-parented
children
Not checking for this would result in `clutter_actor_add_child`
failing, but StBin keeping a copy in `priv->child`. So later on,
`st_bin_remove` would never be called on it and this assertion
would fail and crash the whole shell:
```
static void
st_bin_destroy (ClutterActor *actor)
{
StBinPrivate *priv = st_bin_get_instance_private (ST_BIN (actor));
if (priv->child)
clutter_actor_destroy (priv->child);
g_assert (priv->child == NULL);
```
By disallowing spurious `st_bin_set_child` calls we now prevent StBin
from entering such a corrupt state and the above assertion won't fail
anymore.
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1507>
---
src/st/st-bin.c | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/st/st-bin.c b/src/st/st-bin.c
index f013909e8..7959a4e95 100644
--- a/src/st/st-bin.c
+++ b/src/st/st-bin.c
@@ -434,6 +434,19 @@ st_bin_set_child (StBin *bin,
if (priv->child == child)
return;
+ if (child)
+ {
+ ClutterActor *parent = clutter_actor_get_parent (child);
+
+ if (parent)
+ {
+ g_warning ("%s: The provided 'child' actor %p already has a "
+ "(different) parent %p and can't be made a child of %p.",
+ G_STRFUNC, child, parent, bin);
+ return;
+ }
+ }
+
if (priv->child)
clutter_actor_remove_child (CLUTTER_ACTOR (bin), priv->child);
--
2.38.1