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libxl: unref objects in error paths

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libxlMakeNic opens a virConnect object and takes a reference on a
virNetwork object, but doesn't drop the references on all error
paths. Rework the function to follow the standard libvirt pattern
of using a local 'ret' variable to hold the function return value,
performing all cleanup and returning 'ret' at a 'cleanup' label.
This commit is contained in:
Jim Fehlig 2016-02-24 15:40:00 -07:00
parent 5430ee3aa6
commit e4f1be7eb6
1 changed files with 23 additions and 31 deletions
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54
src/libxl/libxl_conf.c
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@ -1286,7 +1286,10 @@ libxlMakeNic(virDomainDefPtr def,
{
bool ioemu_nic = def->os.type == VIR_DOMAIN_OSTYPE_HVM;
virDomainNetType actual_type = virDomainNetGetActualType(l_nic);
virNetworkPtr network = NULL;
virConnectPtr conn = NULL;
virNetDevBandwidthPtr actual_bw;
int ret = -1;
/* TODO: Where is mtu stored?
*
@ -1312,64 +1315,47 @@ libxlMakeNic(virDomainDefPtr def,
if (l_nic->model) {
if (VIR_STRDUP(x_nic->model, l_nic->model) < 0)
return -1;
goto cleanup;
if (STREQ(l_nic->model, "netfront"))
x_nic->nictype = LIBXL_NIC_TYPE_VIF;
}
if (VIR_STRDUP(x_nic->ifname, l_nic->ifname) < 0)
return -1;
goto cleanup;
switch (actual_type) {
case VIR_DOMAIN_NET_TYPE_BRIDGE:
if (VIR_STRDUP(x_nic->bridge,
virDomainNetGetActualBridgeName(l_nic)) < 0)
return -1;
goto cleanup;
/* fallthrough */
case VIR_DOMAIN_NET_TYPE_ETHERNET:
if (VIR_STRDUP(x_nic->script, l_nic->script) < 0)
return -1;
goto cleanup;
if (l_nic->nips > 0) {
x_nic->ip = virSocketAddrFormat(&l_nic->ips[0]->address);
if (!x_nic->ip)
return -1;
goto cleanup;
}
break;
case VIR_DOMAIN_NET_TYPE_NETWORK:
{
bool fail = false;
char *brname = NULL;
virNetworkPtr network;
virConnectPtr conn;
if (!(conn = virConnectOpen("xen:///system")))
return -1;
goto cleanup;
if (!(network =
virNetworkLookupByName(conn, l_nic->data.network.name))) {
virObjectUnref(conn);
return -1;
goto cleanup;
}
if (l_nic->nips > 0) {
x_nic->ip = virSocketAddrFormat(&l_nic->ips[0]->address);
if (!x_nic->ip)
return -1;
goto cleanup;
}
if ((brname = virNetworkGetBridgeName(network))) {
if (VIR_STRDUP(x_nic->bridge, brname) < 0)
fail = true;
} else {
fail = true;
}
VIR_FREE(brname);
virObjectUnref(network);
virObjectUnref(conn);
if (fail)
return -1;
if (!(x_nic->bridge = virNetworkGetBridgeName(network)))
goto cleanup;
break;
}
case VIR_DOMAIN_NET_TYPE_VHOSTUSER:
@ -1385,18 +1371,18 @@ libxlMakeNic(virDomainDefPtr def,
virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
_("unsupported interface type %s"),
virDomainNetTypeToString(l_nic->type));
return -1;
goto cleanup;
}
if (l_nic->domain_name) {
#ifdef LIBXL_HAVE_DEVICE_BACKEND_DOMNAME
if (VIR_STRDUP(x_nic->backend_domname, l_nic->domain_name) < 0)
return -1;
goto cleanup;
#else
virReportError(VIR_ERR_XML_DETAIL, "%s",
_("this version of libxenlight does not "
"support backend domain name"));
return -1;
goto cleanup;
#endif
}
@ -1438,7 +1424,13 @@ libxlMakeNic(virDomainDefPtr def,
x_nic->rate_interval_usecs = 50000UL;
}
return 0;
ret = 0;
cleanup:
virObjectUnref(network);
virObjectUnref(conn);
return ret;
}
static int