At the beginning of the function qemuPrepareHostdevPCICheckSupport() is called. After that @pcidevs is initialized. However, if the very first command fails, we go to 'cleanup' label where virObjectUnref(pcidevs) is called. Obviously, it is called before @pcidevs was able to get initialized. Compiler warns about it: CC qemu/libvirt_driver_qemu_impl_la-qemu_hostdev.lo qemu/qemu_hostdev.c: In function 'qemuPrepareHostdevPCIDevices': qemu/qemu_hostdev.c:824:19: error: 'pcidevs' may be used uninitialized in this function [-Werror=maybe-uninitialized] virObjectUnref(pcidevs); ^ cc1: all warnings being treated as errors Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- Pushed under buildbreaker and trivial rules. src/qemu/qemu_hostdev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/qemu/qemu_hostdev.c b/src/qemu/qemu_hostdev.c index 81e0e88..43c03cc 100644 --- a/src/qemu/qemu_hostdev.c +++ b/src/qemu/qemu_hostdev.c @@ -633,7 +633,7 @@ qemuPrepareHostdevPCIDevices(virQEMUDriverPtr driver, int nhostdevs, virQEMUCapsPtr qemuCaps) { - virPCIDeviceListPtr pcidevs; + virPCIDeviceListPtr pcidevs = NULL; int last_processed_hostdev_vf = -1; size_t i; int ret = -1; -- 1.8.1.5