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A virDomainNetDef object in a domain's nets array might contain a virDomainHostdevDef, and when this is the case, the domain's hostdevs array will also have a pointer to this embedded hostdev (this is done so that internal functions that need to perform some operation on all hostdevs won't leave out the type='hostdev' network interfaces). When a network device was updated with virDomainUpdateDeviceFlags(), we were replacing the entry in the nets array (and free'ing the original) but forgetting about the pointer in the hostdevs array (which would then point to the now-free'd hostdev contained in the old net object.) This often resulted in a libvirtd crash. The solution is to add a function, virDomainNetUpdate(), called by qemuDomainUpdateDeviceConfig(), that updates the hostdevs array appropriately along with the nets array. Resolves: https://bugzilla.redhat.com/1558934 Signed-off-by: Laine Stump <laine@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>