It seems the broadcast address parameter is not optional now, if users haven't specified the broadcast address to the network interface then a segfault will be raised. This patch is just a temporary solution to avoid segfault, and with the patch, users will get a expected error "Unable to parse networks: Unable to parse broadcast address (null)", of course, a better patch should automatically generate a broadcast address according to actual ip address. But AFAIK, the IPv6 hasn't defined broadcast address, so it needs to do address protocol judgement firstly, I will try to implement it later. * How to reproduce? # virt-sandbox -c lxc:/// --network address=192.168.122.1 /bin/sh or # virt-sandbox -c lxc:/// --network address=192.168.122.1/24 /bin/sh Signed-off-by: Alex Jia <ajia(a)redhat.com&gt; --- libvirt-sandbox/libvirt-sandbox-config.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-) diff --git a/libvirt-sandbox/libvirt-sandbox-config.c b/libvirt-sandbox/libvirt-sandbox-config.c index 3dc453a..f392f4b 100644 --- a/libvirt-sandbox/libvirt-sandbox-config.c +++ b/libvirt-sandbox/libvirt-sandbox-config.c @@ -873,6 +873,14 @@ gboolean gvir_sandbox_config_add_network_strv(GVirSandboxConfig *config, goto cleanup; } + if (!bcast) { + g_set_error(error, GVIR_SANDBOX_CONFIG_ERROR, 0, + "Unable to parse broadcast address %s", bcast); + g_free(primary); + goto cleanup; + + } + if (!(bcastaddr = g_inet_address_new_from_string(bcast))) { g_set_error(error, GVIR_SANDBOX_CONFIG_ERROR, 0, "Unable to parse address %s", bcast); -- 1.7.1