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virtio-scsi: Unset hotplug handler when unrealize 

This matches the qbus_set_hotplug_handler in realize, and it releases
the final reference to the embedded VirtIODevice so that it is
properly finalized.

A use-after-free is fixed with this patch, indirectly:
virtio_device_instance_finalize wasn't called at hot-unplug, and the
vdev->listener would be a dangling pointer in the global and the per
address space listener list. See also RHBZ 1449031.

Cc: qemu-stable@nongnu.org
Signed-off-by: Fam Zheng <famz@redhat.com>
Message-Id: <20170518102808.30046-1-famz@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Fam Zheng 2017-05-18 18:28:08 +08:00 committed by Paolo Bonzini
parent 003a0cf2cd
commit 2cbe2de545
1 changed files with 3 additions and 0 deletions
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3
hw/scsi/virtio-scsi.c
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@ -918,6 +918,9 @@ void virtio_scsi_common_unrealize(DeviceState *dev, Error **errp)
static void virtio_scsi_device_unrealize(DeviceState *dev, Error **errp)
{
VirtIOSCSI *s = VIRTIO_SCSI(dev);
qbus_set_hotplug_handler(BUS(&s->bus), NULL, &error_abort);
virtio_scsi_common_unrealize(dev, errp);
}