vhost: ensure vhost_ops are set before calling iotlb callback
commit384b557da1a44ce260cd0328c06a250507348f73
authorMaxime Coquelin <maxime.coquelin@redhat.com>
Fri, 30 Jun 2017 16:04:21 +0000 (30 18:04 +0200)
committerMichael S. Tsirkin <mst@redhat.com>
Mon, 3 Jul 2017 19:29:49 +0000 (3 22:29 +0300)
tree04307e9efcca4c3105516353f300aa1d843de672
parent552a1e01a41d7c24397a83947cca94d8d66e5f49
vhost: ensure vhost_ops are set before calling iotlb callback

This patch fixes a crash that happens when vhost-user iommu
support is enabled and vhost-user socket is closed.

When it happens, if an IOTLB invalidation notification is sent
by the IOMMU, vhost_ops's NULL pointer is dereferenced.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
hw/virtio/vhost-backend.c