[evolution-data-server] Bug 725295 - Crash in e_cal_backend_remove_view()

[Milan Crha <mcrha src gnome org>]

commit cd9ec8ea22010fdbd0726f8648a78c4affd3037a
Author: Milan Crha <mcrha redhat com>
Date:   Tue Mar 13 18:15:29 2018 +0100

    Bug 725295 - Crash in e_cal_backend_remove_view()

 src/addressbook/libedata-book/e-book-backend.c |    5 +++++
 src/calendar/libedata-cal/e-cal-backend.c      |    5 +++++
 src/libebackend/e-backend.c                    |    4 ++++
 3 files changed, 14 insertions(+), 0 deletions(-)
---
diff --git a/src/addressbook/libedata-book/e-book-backend.c b/src/addressbook/libedata-book/e-book-backend.c
index af845d8..5ab1e91 100644
--- a/src/addressbook/libedata-book/e-book-backend.c
+++ b/src/addressbook/libedata-book/e-book-backend.c
@@ -3140,6 +3140,9 @@ e_book_backend_remove_view (EBookBackend *backend,
 
        g_return_if_fail (E_IS_BOOK_BACKEND (backend));
 
+       /* In case the view holds the last reference to backend */
+       g_object_ref (backend);
+
        g_mutex_lock (&backend->priv->views_mutex);
 
        list = backend->priv->views;
@@ -3153,6 +3156,8 @@ e_book_backend_remove_view (EBookBackend *backend,
        backend->priv->views = list;
 
        g_mutex_unlock (&backend->priv->views_mutex);
+
+       g_object_unref (backend);
 }
 
 /**
diff --git a/src/calendar/libedata-cal/e-cal-backend.c b/src/calendar/libedata-cal/e-cal-backend.c
index 603567a..3756665 100644
--- a/src/calendar/libedata-cal/e-cal-backend.c
+++ b/src/calendar/libedata-cal/e-cal-backend.c
@@ -1473,6 +1473,9 @@ e_cal_backend_remove_view (ECalBackend *backend,
        g_return_if_fail (backend != NULL);
        g_return_if_fail (E_IS_CAL_BACKEND (backend));
 
+       /* In case the view holds the last reference to backend */
+       g_object_ref (backend);
+
        g_mutex_lock (&backend->priv->views_mutex);
 
        list = backend->priv->views;
@@ -1486,6 +1489,8 @@ e_cal_backend_remove_view (ECalBackend *backend,
        backend->priv->views = list;
 
        g_mutex_unlock (&backend->priv->views_mutex);
+
+       g_object_unref (backend);
 }
 
 /**
diff --git a/src/libebackend/e-backend.c b/src/libebackend/e-backend.c
index 3c92f47..ebbea1a 100644
--- a/src/libebackend/e-backend.c
+++ b/src/libebackend/e-backend.c
@@ -1536,5 +1536,9 @@ e_backend_prepare_shutdown (EBackend *backend)
        class = E_BACKEND_GET_CLASS (backend);
        g_return_if_fail (class->prepare_shutdown != NULL);
 
+       g_object_ref (backend);
+
        class->prepare_shutdown (backend);
+
+       g_object_unref (backend);
 }