The @prefix attribute to <ip/> element for interface type user is optional. Therefore, if left out it has value of zero in which case we should not check whether it falls into <4, 27> range. Otherwise we fail parsing domain XML for no good reason. Signed-off-by: Michal Privoznik <mprivozn(a)redhat.com&gt; --- src/qemu/qemu_domain.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c index afd572fc5e..c1798edf41 100644 --- a/src/qemu/qemu_domain.c +++ b/src/qemu/qemu_domain.c @@ -4373,7 +4373,8 @@ qemuDomainDeviceDefValidateNetwork(const virDomainNetDef *net) } hasIPv4 = true; - if (ip->prefix < 4 || ip->prefix > 27) { + if (ip->prefix > 0 && + (ip->prefix < 4 || ip->prefix > 27)) { virReportError(VIR_ERR_XML_ERROR, "%s", _("invalid prefix, must be in range of 4-27")); return -1; -- 2.16.4