On Fri, Jun 28, 2019 at 02:36:56PM +0200, Stefano Garzarella wrote: > 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/ This looks good to me. Did you run any stress tests? For example an SMP guest constantly connecting and sending packets together with a script that hotplug/unplugs vhost-vsock-pci from the host side. Stefan
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