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Daniel P. Berrange
0302391ee6
Fix race in ref counting when handling RPC jobs
When an incoming RPC message is ready for processing, virNetServerClientDispatchRead() will invoke the 'dispatchFunc' callback. This is set to virNetServerDispatchNewMessage This function puts the message + client in a queue for processing by the thread pool. The thread pool worker function is virNetServerHandleJob The first thing this does is acquire an extra reference on the 'client'. Unfortunately, between the time the message+client are put on the thread pool queue, and the time the worker runs, the client object may have had its last reference removed. We clearly need to add the reference to the client object before putting the client on the processing queue * src/rpc/virnetserverclient.c: Add a reference to the client when invoking the dispatch function * src/rpc/virnetserver.c: Don't acquire a reference to the client when in the worker thread
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>
Description
Libvirt provides a portable, long term stable C API for managing the
virtualization technologies provided by many operating systems. It
includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware
vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER
Hypervisor.
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