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virDomainParseMemory parses the size and then rounds up while converting it to kibibytes. Since the number is limit-checked before the rounding it's possible to use a number that would be correctly parsed the first time, but not the second time. For numbers not limited to 32 bit systems the magic is 9223372036854775807 bytes. That number then can't be parsed back in kibibytes. To solve the issue add a second overflow check for the few values that would cause the problem. Since virDomainParseMemory is used in config parsing, this avoids vanishing VMs. Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1221504
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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