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x11: Do not trust there is task in error paths

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Flushing the X11 selection output stream may happen synchronously or
implicitly, in which case there is not a task to complete. Check there
is actually a task before returning errors. We additionally set the
pipe_error flag, so future operations will fail with an error, albeit
with a more generic message.

https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1198

(cherry picked from commit 1909977a67)
This commit is contained in:
Carlos Garnacho 2020-04-15 10:46:34 +02:00 committed by Robert Mader
parent 1e17f8813b
commit 20cf6b630d
1 changed files with 10 additions and 7 deletions
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17
src/x11/meta-x11-selection-output-stream.c
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@ -282,13 +282,16 @@ meta_x11_selection_output_stream_perform_flush (MetaX11SelectionOutputStream *st
priv->delete_pending = FALSE;
priv->pipe_error = TRUE;
XGetErrorText (xdisplay, error_code, error_str, sizeof (error_str));
g_task_return_new_error (priv->pending_task,
G_IO_ERROR,
G_IO_ERROR_BROKEN_PIPE,
"Failed to flush selection output stream: %s",
error_str);
g_clear_object (&priv->pending_task);
if (priv->pending_task)
{
XGetErrorText (xdisplay, error_code, error_str, sizeof (error_str));
g_task_return_new_error (priv->pending_task,
G_IO_ERROR,
G_IO_ERROR_BROKEN_PIPE,
"Failed to flush selection output stream: %s",
error_str);
g_clear_object (&priv->pending_task);
}
}
else if (priv->pending_task && priv->data->len == 0 && !priv->delete_pending)
{