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gdbusconnection: Fix race between subtree method call and unregistration

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Fix another variant of the previous commit, this time specific to the
idle callback of a method call on a subtree object, racing with
unregistration of that subtree.

In this case, the `process_subtree_vtable_message_in_idle_cb()` idle
callback already has a pointer to the right `ExportedSubtree` struct,
but again doesn’t have a strong reference to it.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Helps: #2400
This commit is contained in:
Philip Withnall 2021-09-24 10:55:10 +01:00
parent 50fbf05d61
commit 117b748e44
1 changed files with 4 additions and 3 deletions
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7
gio/gdbusconnection.c
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@ -6824,14 +6824,15 @@ handle_subtree_method_invocation (GDBusConnection *connection,
typedef struct
{
GDBusMessage *message;
ExportedSubtree *es;
GDBusMessage *message; /* (owned) */
ExportedSubtree *es; /* (owned) */
} SubtreeDeferredData;
static void
subtree_deferred_data_free (SubtreeDeferredData *data)
{
g_object_unref (data->message);
exported_subtree_unref (data->es);
g_free (data);
}
@ -6890,7 +6891,7 @@ subtree_message_func (GDBusConnection *connection,
data = g_new0 (SubtreeDeferredData, 1);
data->message = g_object_ref (message);
data->es = es;
data->es = exported_subtree_ref (es);
/* defer this call to an idle handler in the right thread */
idle_source = g_idle_source_new ();