[gvfs/nfs] Prevent a double-free when the remote server forces a disconnect

[Ross Lagerwall <rossl src gnome org>]

commit 944003062870346a13e5a1669af87f27ae1ae888
Author: Ross Lagerwall <rosslagerwall gmail com>
Date:   Mon Nov 24 23:30:54 2014 +0000

    Prevent a double-free when the remote server forces a disconnect

 daemon/gvfsbackendnfs.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/daemon/gvfsbackendnfs.c b/daemon/gvfsbackendnfs.c
index 46012f0..a823191 100644
--- a/daemon/gvfsbackendnfs.c
+++ b/daemon/gvfsbackendnfs.c
@@ -155,6 +155,7 @@ nfs_source_prepare (GSource *source, gint *timeout)
     {
       g_vfs_backend_force_unmount (G_VFS_BACKEND (nfs_source->backend));
       nfs_destroy_context (nfs_source->ctx);
+      nfs_source->backend->ctx = NULL;
       g_source_destroy (source);
       g_source_unref (source);
     }
@@ -193,6 +194,7 @@ nfs_source_dispatch (GSource *source, GSourceFunc callback, gpointer user_data)
                  err, nfs_get_error (nfs_source->ctx));
       g_vfs_backend_force_unmount (G_VFS_BACKEND (nfs_source->backend));
       nfs_destroy_context (nfs_source->ctx);
+      nfs_source->backend->ctx = NULL;
       g_source_destroy (source);
       g_source_unref (source);
     }