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69 lines
2.5 KiB
69 lines
2.5 KiB
From 4be4c56b4f8a52b1cd5f8aadee273706c28ae332 Mon Sep 17 00:00:00 2001
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From: Beniamino Galvani <bgalvani@redhat.com>
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Date: Sat, 13 Jan 2024 18:10:02 +0100
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Subject: [PATCH 1/1] service: fix wrong refcounting in D-Bus handler for
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Callback()
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The Callback() D-Bus method is handled via a GDBus-generated skeleton
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code in nm-libreswan-helper-service-dbus.c, function
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_nmdbus_libreswan_helper_skeleton_handle_method_call(). The function
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emits signal "handle-callback" to let the program handle the incoming
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method. As documented in the GDoc comments, the signal handler must
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return TRUE if it handles the call.
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```
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/**
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* NMDBusLibreswanHelper::handle-callback:
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* @object: A #NMDBusLibreswanHelper.
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* @invocation: A #GDBusMethodInvocation.
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* @arg_environment: Argument passed by remote caller.
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* Signal emitted when a remote caller is invoking the Callback()
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D-Bus method.
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* If a signal handler returns %TRUE, it means the signal handler
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will handle the invocation (e.g. take a reference to @invocation
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and eventually call nmdbus_libreswan_helper_complete_callback()
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or e.g. g_dbus_method_invocation_return_error() on it) and no
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other signal handlers will run. If no signal handler handles the
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invocation, the %G_DBUS_ERROR_UNKNOWN_METHOD error is returned.
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* Returns: %G_DBUS_METHOD_INVOCATION_HANDLED or %TRUE if the
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invocation was handled, %G_DBUS_METHOD_INVOCATION_UNHANDLED or
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%FALSE to let other signal handlers run.
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*/
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```
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At the moment, in case of error the handler first calls
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nmdbus_libreswan_helper_complete_callback() which decreases the
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refcount of "invocation", and then returns FALSE which tells the
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skeleton code to return an error, also unreferencing the
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invocation. This causes a crash.
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Since the G_DBUS_METHOD_INVOCATION_HANDLED alias for TRUE is only
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available since GLib 2.68 (while we target 2.36), just return TRUE.
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Fixes: acb9eb9de50b ('service: process the configuration in the service, not the helper')
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(cherry picked from commit 8ceb901719acac3778e1d76779d9c14289185157)
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---
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src/nm-libreswan-service.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/src/nm-libreswan-service.c b/src/nm-libreswan-service.c
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index fc470a6..4850729 100644
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--- a/src/nm-libreswan-service.c
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+++ b/src/nm-libreswan-service.c
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@@ -1379,7 +1379,8 @@ out:
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}
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nmdbus_libreswan_helper_complete_callback (object, invocation);
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- return success;
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+
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+ return TRUE;
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}
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/****************************************************************/
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--
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2.43.0
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