migration: add a few more pre-conditions in migration code

Those preconditions help to figure out several issues related to
migration.

2 files changed, 5 insertions, 0 deletions

diff --git a/gtk/channel-main.c b/gtk/channel-main.c
index 1ad090f..62e8905 100644
--- a/gtk/channel-main.c
+++ b/gtk/channel-main.c
@@ -2074,6 +2074,8 @@ static gboolean migrate_connect(gpointer data)
     g_return_val_if_fail(c != NULL, FALSE);
 
     session = spice_channel_get_session(mig->src_channel);
+    g_return_val_if_fail(session->priv->migration == NULL, FALSE);
+
     mig->session = spice_session_new_from_session(session);
     mig->session->priv->migration_copy = true;
 
diff --git a/gtk/spice-channel.c b/gtk/spice-channel.c
index 6c24bf5..fd52683 100644
--- a/gtk/spice-channel.c
+++ b/gtk/spice-channel.c
@@ -2500,6 +2500,8 @@ gboolean spice_channel_connect(SpiceChannel *channel)
     if (c->state >= SPICE_CHANNEL_STATE_CONNECTING)
         return TRUE;
 
+    g_return_val_if_fail(channel->priv->fd == -1, FALSE);
+
     return channel_connect(channel);
 }
 
@@ -2522,6 +2524,7 @@ gboolean spice_channel_open_fd(SpiceChannel *channel, int fd)
 
     g_return_val_if_fail(SPICE_IS_CHANNEL(channel), FALSE);
     g_return_val_if_fail(channel->priv != NULL, FALSE);
+    g_return_val_if_fail(channel->priv->fd == -1, FALSE);
     g_return_val_if_fail(fd >= -1, FALSE);
 
     c = channel->priv;