[libvirt] [PATCH] Fix segfault if virtual network has no bridge listed

[Cole Robinson]

The attached patch fixes a libvirtd segfault if we try to call
virNetworkGetBridgeName on a virtual network with no bridge in its xml.
This occurs if the network hasn't been started as long as the daemon has
been running.

This patch also cleans up an error path in qemu_conf which was
overwriting the error returned by virNetworkGetBridgeName.

Thanks,
Cole

diff --git a/src/network_driver.c b/src/network_driver.c
index f233dca..0978341 100644
--- a/src/network_driver.c
+++ b/src/network_driver.c
@@ -1182,6 +1182,13 @@ static char *networkGetBridgeName(virNetworkPtr net) {
         goto cleanup;
     }
 
+    if (!(network->def->bridge)) {
+        networkReportError(net->conn, NULL, net, VIR_ERR_INTERNAL_ERROR,
+                           _("network '%s' does not have a bridge name."),
+                           network->def->name);
+        goto cleanup;
+    }
+
     bridge = strdup(network->def->bridge);
     if (!bridge)
         networkReportError(net->conn, NULL, net, VIR_ERR_NO_MEMORY,
diff --git a/src/qemu_conf.c b/src/qemu_conf.c
index e6c378f..ff1cd29 100644
--- a/src/qemu_conf.c
+++ b/src/qemu_conf.c
@@ -549,9 +549,6 @@ qemudNetworkIfaceConnect(virConnectPtr conn,
         virNetworkFree(network);
 
         if (brname == NULL) {
-            qemudReportError(conn, NULL, NULL, VIR_ERR_INTERNAL_ERROR,
-                             _("Network '%s' is not active"),
-                             net->data.network.name);
             goto error;
         }
     } else if (net->type == VIR_DOMAIN_NET_TYPE_BRIDGE) {

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