linux-kernel - [PATCH v2 0/3] vsock/virtio: several fixes in the .probe() and .remove()

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Message-Id: <20190628123659.139576-1-sgarzare@redhat.com>
Date:   Fri, 28 Jun 2019 14:36:56 +0200
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     netdev@...r.kernel.org
Cc:     kvm@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] vsock/virtio: several fixes in the .probe() and .remove()

During the review of "[PATCH] vsock/virtio: Initialize core virtio vsock
before registering the driver", Stefan pointed out some possible issues
in the .probe() and .remove() callbacks of the virtio-vsock driver.

This series tries to solve these issues:
- Patch 1 adds RCU critical sections to avoid use-after-free of
  'the_virtio_vsock' pointer.
- Patch 2 stops workers before to call vdev->config->reset(vdev) to
  be sure that no one is accessing the device.
- Patch 3 moves the works flush at the end of the .remove() to avoid
  use-after-free of 'vsock' object.

v2:
- Patch 1: use RCU to protect 'the_virtio_vsock' pointer
- Patch 2: no changes
- Patch 3: flush works only at the end of .remove()
- Removed patch 4 because virtqueue_detach_unused_buf() returns all the buffers
  allocated.

v1: https://patchwork.kernel.org/cover/10964733/

Stefano Garzarella (3):
  vsock/virtio: use RCU to avoid use-after-free on the_virtio_vsock
  vsock/virtio: stop workers during the .remove()
  vsock/virtio: fix flush of works during the .remove()

 net/vmw_vsock/virtio_transport.c | 131 ++++++++++++++++++++++++-------
 1 file changed, 102 insertions(+), 29 deletions(-)

-- 
2.20.1