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b59e59845f
There were certain paths through the hostdev detach code that could lead to the lower level function failing (and not removing the object from the domain's hostdevs list), but the higher level function free'ing the hostdev object anyway. This would leave a stale hostdevdef pointer in the list, which would surely cause a problem eventually. This patch relocates virDomainHostdevRemove from the lower level functions qemuDomainDetachThisHostDevice and qemuDomainDetachHostPciDevice, to their caller qemuDomainDetachThisHostDevice, placing it just before the call to virDomainHostdevDefFree. This makes it easy to verify that either both operations are done, or neither. NB: The "dangling pointer" part of this problem was introduced in commit 13d5a6, so it is not present in libvirt versions prior to 0.9.9. Earlier versions would return failure in certain cases even though the the device object was removed/deleted, but the removal and deletion operations would always both happen or neither.
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>