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Detected by valgrind. Leak is introduced in commit 3bb6bcf. Free 'vol' memory before allocating memory, the codes will miss one time free when 'vol_i = nvolumes' in for loop, so plug memory leak. * tools/virsh.c: fix memory leak on cmdUndefine. * How to reproduce? % dd if=/dev/null of=/var/lib/libvirt/images/foo bs=1 count=1 seek=10M % virsh define foo.xml (disk source file points to '/var/lib/libvirt/images/foo') % virsh vol-clone foo foo-clone default (the original guest name is 'foo') % virsh pool-refresh default % virsh vol-list default (make sure 'foo-clone' volume exists) % virsh define foo-clone.xml (disk source file points to '/var/lib/libvirt/images/foo-clone') % valgrind -v --leak-check=full virsh undefine foo-clone --remove-all-storage * Actual results: 1. virsh output Domain foo-clone has been undefined Volume '/var/lib/libvirt/images/foo-clone' removed. error: Failed to disconnect from the hypervisor, 1 leaked reference(s) 2. valgrind result ==6515== 92 (40 direct, 52 indirect) bytes in 1 blocks are definitely lost in loss record 46 of 69 ==6515== at 0x4A04A28: calloc (vg_replace_malloc.c:467) ==6515== by 0x4C89B71: virAlloc (memory.c:101) ==6515== by 0x4CFCACE: virGetStorageVol (datatypes.c:724) ==6515== by 0x4D4A8E0: remoteStorageVolLookupByPath (remote_driver.c:4664) ==6515== by 0x4D07153: virStorageVolLookupByPath (libvirt.c:12508) ==6515== by 0x4270E6: cmdUndefine (virsh.c:2828) ==6515== by 0x4151B6: vshCommandRun (virsh.c:17693) ==6515== by 0x4264D3: main (virsh.c:19270) ==6515== ==6515== LEAK SUMMARY: ==6515== definitely lost: 40 bytes in 1 blocks RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=786674 Signed-off-by: Alex Jia <ajia@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>