Re: [libvirt] [PATCH] network: fix crash when portgroup has no name

This resolves: https://bugzilla.redhat.com/show_bug.cgi?id=879473 The name attribute is required for portgroup elements (yes, the RNG specifies that), and there is code in libvirt that assumes it is non-null. Unfortunately, the portgroup parsing function wasn't checking for lack of portgroup. One adverse result of this was that attempts to update a network by adding a portgroup with no name would cause libvirtd to segfault. For example: virsh net-update default add portgroup "<portgroup default='yes'/>" This patch causes virNetworkPortGroupParseXML to fail if no name is specified, thus avoiding any later problems.

--- src/conf/network_conf.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/src/conf/network_conf.c b/src/conf/network_conf.c index 228951d..6ce2e63 100644 --- a/src/conf/network_conf.c +++ b/src/conf/network_conf.c @@ -1175,6 +1175,12 @@ virNetworkPortGroupParseXML(virPortGroupDefPtr def, /* grab raw data from XML */ def->name = virXPathString("string(./@name)", ctxt); + if (!def->name) { + virReportError(VIR_ERR_XML_ERROR, "%s", + _("Missing required name attribute in portgroup")); + goto error; + } + isDefault = virXPathString("string(./@default)", ctxt); def->isDefault = isDefault && STRCASEEQ(isDefault, "yes");