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If virDomainDiskDefFree(disk) is called in 'skipdisk:', then it's possible to either return to skipdisk without reallocating a new disk (via the if condition just prior) or to end the loop having deleted the disk. Since virDomainDiskDefFree() does not pass by reference, disk isn't changed in this context, thus the possible issue.
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>