On Fri, Jun 28, 2019 at 02:36:57PM +0200, Stefano Garzarella wrote: > Some callbacks used by the upper layers can run while we are in the > .remove(). A potential use-after-free can happen, because we free > the_virtio_vsock without knowing if the callbacks are over or not. > > To solve this issue we move the assignment of the_virtio_vsock at the > end of .probe(), when we finished all the initialization, and at the > beginning of .remove(), before to release resources. > For the same reason, we do the same also for the vdev->priv. > > We use RCU to be sure that all callbacks that use the_virtio_vsock > ended before freeing it. This is not required for callbacks that > use vdev->priv, because after the vdev->config->del_vqs() we are sure > that they are ended and will no longer be invoked. My question is answered in Patch 3.
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