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Michal Privoznik
f2a4e5f176
https://bugzilla.redhat.com/show_bug.cgi?id=892079 With current code, if user calls virDomainPMSuspendForDuration() followed by virDomainDestroy(), the former API checks for qemu agent presence, which will evaluate as true (if agent is configured). While talking to qemu agent, the qemu driver is unlocked, so the latter API starts executing. However, if machine dies meanwhile, libvirtd gets EOF on the agent socket and qemuProcessHandleAgentEOF() is called. The handler clears reference to qemu agent while the destroy API already holding a reference to it. This leads to NULL dereferencing later in the code. Therefore, the agent pointer should be set to NULL only if we are the exclusive owner of it.
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>