From: YueHaibing yuehaibing@huawei.com
commit 80a316ff16276b36d0392a8f8b2f63259857ae98 upstream.
If xenbus_register_frontend() fails in p9_trans_xen_init, we should call v9fs_unregister_trans() to do cleanup.
Link: http://lkml.kernel.org/r/20190430143933.19368-1-yuehaibing@huawei.com Cc: stable@vger.kernel.org Fixes: 868eb122739a ("xen/9pfs: introduce Xen 9pfs transport driver") Signed-off-by: YueHaibing yuehaibing@huawei.com Signed-off-by: Dominique Martinet dominique.martinet@cea.fr Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/9p/trans_xen.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/net/9p/trans_xen.c +++ b/net/9p/trans_xen.c @@ -530,13 +530,19 @@ static struct xenbus_driver xen_9pfs_fro
static int p9_trans_xen_init(void) { + int rc; + if (!xen_domain()) return -ENODEV;
pr_info("Initialising Xen transport for 9pfs\n");
v9fs_register_trans(&p9_xen_trans); - return xenbus_register_frontend(&xen_9pfs_front_driver); + rc = xenbus_register_frontend(&xen_9pfs_front_driver); + if (rc) + v9fs_unregister_trans(&p9_xen_trans); + + return rc; } module_init(p9_trans_xen_init);