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vsock/virtio: fix kernel panic after device hot-unplug 

virtio_vsock_remove() invokes the vsock_core_exit() also if there
are opened sockets for the AF_VSOCK protocol family. In this way
the vsock "transport" pointer is set to NULL, triggering the
kernel panic at the first socket activity.

This patch move the vsock_core_init()/vsock_core_exit() in the
virtio_vsock respectively in module_init and module_exit functions,
that cannot be invoked until there are open sockets.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1609699
Reported-by: Yan Fu <yafu@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
hifive-unleashed-5.1
Stefano Garzarella 2019-02-01 12:42:06 +01:00 committed by David S. Miller
parent c14f07c621
commit 22b5c0b63f
1 changed files with 18 additions and 8 deletions
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26
net/vmw_vsock/virtio_transport.c
View File

@ -75,6 +75,9 @@ static u32 virtio_transport_get_local_cid(void)
{
struct virtio_vsock *vsock = virtio_vsock_get();
if (!vsock)
return VMADDR_CID_ANY;
return vsock->guest_cid;
}
@ -584,10 +587,6 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
virtio_vsock_update_guest_cid(vsock);
ret = vsock_core_init(&virtio_transport.transport);
if (ret < 0)
goto out_vqs;
vsock->rx_buf_nr = 0;
vsock->rx_buf_max_nr = 0;
atomic_set(&vsock->queued_replies, 0);
@ -618,8 +617,6 @@ static int virtio_vsock_probe(struct virtio_device *vdev)
mutex_unlock(&the_virtio_vsock_mutex);
return 0;
out_vqs:
vsock->vdev->config->del_vqs(vsock->vdev);
out:
kfree(vsock);
mutex_unlock(&the_virtio_vsock_mutex);
@ -669,7 +666,6 @@ static void virtio_vsock_remove(struct virtio_device *vdev)
mutex_lock(&the_virtio_vsock_mutex);
the_virtio_vsock = NULL;
vsock_core_exit();
mutex_unlock(&the_virtio_vsock_mutex);
vdev->config->del_vqs(vdev);
@ -702,14 +698,28 @@ static int __init virtio_vsock_init(void)
virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0);
if (!virtio_vsock_workqueue)
return -ENOMEM;
ret = register_virtio_driver(&virtio_vsock_driver);
if (ret)
destroy_workqueue(virtio_vsock_workqueue);
goto out_wq;
ret = vsock_core_init(&virtio_transport.transport);
if (ret)
goto out_vdr;
return 0;
out_vdr:
unregister_virtio_driver(&virtio_vsock_driver);
out_wq:
destroy_workqueue(virtio_vsock_workqueue);
return ret;
}
static void __exit virtio_vsock_exit(void)
{
vsock_core_exit();
unregister_virtio_driver(&virtio_vsock_driver);
destroy_workqueue(virtio_vsock_workqueue);
}