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This bug was revealed by the crash described in https://bugzilla.redhat.com/show_bug.cgi?id=852383 The vlan info pointer sent to virNetDevOpenvswitchAddPort should never be non-NULL unless there is at least one tag. The factthat such a vlan info pointer was receveid pointed out that a caller was passing the wrong pointer. Instead of sending &net->vlan, the result of virDomainNetGetActualVlan(net) should be sent - that function will look for vlan info in net->data.network.actual->vlan, and in cany case return NULL instead of a pointer if the vlan info it finds has no tags. Aside from causing the crash, sending a hardcoded &net->vlan has the effect of ignoring vlan info from a <network> or <portgroup> config.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>