Re: [libvirt] [PATCH] Fix mem leak in virQEMUCapsProbeQMPMachineTypes on OOM

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; The virQEMUCapsProbeQMPMachineTypes method iterates over machine types copying them into the qemuCapsPtr object. It only updates the qemuCaps->nmachinetypes value at the end though. So if OOM occurs in the middle, the destructor of qemuCapsPtr will not free the partially initialized machine types. Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; --- src/qemu/qemu_capabilities.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c index 71a913b..2712a4d 100644 --- a/src/qemu/qemu_capabilities.c +++ b/src/qemu/qemu_capabilities.c @@ -2137,14 +2137,17 @@ virQEMUCapsProbeQMPMachineTypes(virQEMUCapsPtr qemuCaps, goto cleanup; for (i = 0; i < nmachines; i++) { - if (VIR_STRDUP(qemuCaps->machineAliases[i], machines[i]->alias) < 0 || - VIR_STRDUP(qemuCaps->machineTypes[i], machines[i]->name) < 0) + qemuCaps->nmachineTypes++; + if (VIR_STRDUP(qemuCaps->machineAliases[qemuCaps->nmachineTypes -1], + machines[i]->alias) < 0 || + VIR_STRDUP(qemuCaps->machineTypes[qemuCaps->nmachineTypes - 1], + machines[i]->name) < 0) goto cleanup; if (machines[i]->isDefault) defIdx = i; - qemuCaps->machineMaxCpus[i] = machines[i]->maxCpus; + qemuCaps->machineMaxCpus[qemuCaps->nmachineTypes - 1] = + machines[i]->maxCpus; } - qemuCaps->nmachineTypes = nmachines;