From c4f753859ae6da1aeb93cad19c586fea1925e269 Mon Sep 17 00:00:00 2001 From: Ilya Maximets Date: Mon, 8 Oct 2018 19:05:36 +0300 Subject: [PATCH] vhost-user: Fix userfaultfd leak 'fd' received from the vhost side is never freed. Also, everything (including 'postcopy_listen' state) should be cleaned up on vhost cleanup. Fixes: 46343570c06e ("vhost+postcopy: Wire up POSTCOPY_END notify") Fixes: f82c11165ffa ("vhost+postcopy: Register shared ufd with postcopy") Cc: qemu-stable@nongnu.org Signed-off-by: Ilya Maximets Message-Id: <20181008160536.6332-3-i.maximets@samsung.com> Reviewed-by: Dr. David Alan Gilbert Reviewed-by: Maxime Coquelin Signed-off-by: Dr. David Alan Gilbert --- hw/virtio/vhost-user.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index b041343632..ed47d645d9 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -1291,6 +1291,7 @@ static int vhost_user_postcopy_end(struct vhost_dev *dev, Error **errp) return ret; } postcopy_unregister_shared_ufd(&u->postcopy_fd); + close(u->postcopy_fd.fd); u->postcopy_fd.handler = NULL; trace_vhost_user_postcopy_end_exit(); @@ -1430,6 +1431,12 @@ static int vhost_user_backend_cleanup(struct vhost_dev *dev) postcopy_remove_notifier(&u->postcopy_notifier); u->postcopy_notifier.notify = NULL; } + u->postcopy_listen = false; + if (u->postcopy_fd.handler) { + postcopy_unregister_shared_ufd(&u->postcopy_fd); + close(u->postcopy_fd.fd); + u->postcopy_fd.handler = NULL; + } if (u->slave_fd >= 0) { qemu_set_fd_handler(u->slave_fd, NULL, NULL, NULL); close(u->slave_fd);