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54456cc0fd
Detected by Coverity. The code was doing math on shifted unsigned char (which promotes to int), then promoting that to unsigned long during assignment to size. On 64-bit platforms, this risks sign extending values of size > 2GiB. Bug present since commit 489fd3 (v0.6.0). I'm not sure if a specially-crafted bogus qcow2 image could exploit this, although it's probably not possible, since we were already checking for the computed results being within range of our fixed-size buffer. * src/util/storage_file.c (qcowXGetBackingStore): Avoid sign extension.
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>