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Due to nature of operations we do over the string list (more precisely due to how virStringListRemove() works), it is not the best idea to use dataFree callback. Problem is, on MAC address remove, the string list remove function modifies the original list in place. Then, virHashUpdateEntry() is called which frees all the data stored in the list rendering @newMacsList point to freed data. ==16002== Invalid read of size 8 ==16002== at 0x50BC083: virFree (viralloc.c:582) ==16002== by 0x513DC39: virStringListFree (virstring.c:251) ==16002== by 0x51089B4: virMacMapHashFree (virmacmap.c:67) ==16002== by 0x50EF30B: virHashAddOrUpdateEntry (virhash.c:352) ==16002== by 0x50EF4FD: virHashUpdateEntry (virhash.c:415) ==16002== by 0x5108BED: virMacMapRemoveLocked (virmacmap.c:129) ==16002== by 0x51092D5: virMacMapRemove (virmacmap.c:346) ==16002== by 0x402F02: testMACRemove (virmacmaptest.c:107) ==16002== by 0x403F15: virTestRun (testutils.c:180) ==16002== by 0x4032C4: mymain (virmacmaptest.c:205) ==16002== by 0x405A3B: virTestMain (testutils.c:992) ==16002== by 0x403D87: main (virmacmaptest.c:237) ==16002== Address 0xdd5a4d0 is 0 bytes inside a block of size 24 free'd ==16002== at 0x4C2AD6F: realloc (vg_replace_malloc.c:693) ==16002== by 0x50BB99B: virReallocN (viralloc.c:245) ==16002== by 0x513DC0B: virStringListRemove (virstring.c:235) ==16002== by 0x5108BA6: virMacMapRemoveLocked (virmacmap.c:124) ==16002== by 0x51092D5: virMacMapRemove (virmacmap.c:346) ==16002== by 0x402F02: testMACRemove (virmacmaptest.c:107) ==16002== by 0x403F15: virTestRun (testutils.c:180) ==16002== by 0x4032C4: mymain (virmacmaptest.c:205) ==16002== by 0x405A3B: virTestMain (testutils.c:992) ==16002== by 0x403D87: main (virmacmaptest.c:237) Signed-off-by: Michal Privoznik <mprivozn@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>