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In commit 540c339a2535ec30d79e5ef84d8f50a17bc60723 the whole domain reference counting was refactored in the qemu driver. Domain jobs now don't need to reference the domain object as they now expect the reference from the calling function. However, the patch forgot to remove the unref call in case we exit the monitor when we were acquiring a nested job. This caused the daemon to crash on a subsequent access to the domain object once we've done an operation requiring a nested job for a monitor access. An easy reproducer case: 1) Start a vm with qcow disks 2) virsh snapshot-create-as DOMNAME 3) virsh dumpxml DOMNAME 4) daemon crashes in a semi-random spot while accessing a now-removed VM object. Fortunately, the commit wasn't released yet, so there are no security implications. Reported-by: Shanzi Yu <shyu@redhat.com> Signed-off-by: Peter Krempa <pkrempa@redhat.com>
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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