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virtio-serial-bus: Unset hotplug handler when unrealize 

Virtio serial device controls the lifetime of virtio-serial-bus and
virtio-serial-bus links back to the device via its hotplug-handler
property. This extra ref-count prevents the device from getting
finalized, leaving the VirtIODevice memory listener registered and
leading to use-after-free later on.

This patch addresses the same issue as Fam Zheng's
"virtio-scsi: Unset hotplug handler when unrealize"
only for a different virtio device.

Cc: qemu-stable@nongnu.org
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
stable-2.10
Ladi Prosek 2017-05-30 10:59:43 +02:00 committed by Michael S. Tsirkin
parent d47a851cae
commit f811f97040
1 changed files with 3 additions and 0 deletions
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3
hw/char/virtio-serial-bus.c
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@ -1121,6 +1121,9 @@ static void virtio_serial_device_unrealize(DeviceState *dev, Error **errp)
timer_free(vser->post_load->timer);
g_free(vser->post_load);
}
qbus_set_hotplug_handler(BUS(&vser->bus), NULL, errp);
virtio_cleanup(vdev);
}