libxl: fix resource leaks in libxlDomainStart error paths

libxlDomainStart allocates and reserves resources that were not
being released in error paths. libxlDomainCleanup already handles
the job of releasing resources, and libxlDomainStart should call
it when encountering a failure.

Change the error handling logic to call libxlDomainCleanup on
failure. This includes acquiring the lease sooner and allowing
it to be released in libxlDomainCleanup on failure, similar to
the way other resources are reclaimed. With the lease now
released in libxlDomainCleanup, the release_dom label can be
renamed to cleanup_dom to better reflect its changed semantics.
Signed-off-by: NJim Fehlig <jfehlig@suse.com>

src/libxl/libxl_domain.c

@@ -1036,17 +1036,6 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
                                     vm, true) < 0)
         goto cleanup;
 
-    if (libxlBuildDomainConfig(driver->reservedGraphicsPorts, vm->def,
-                               cfg->ctx, &d_config) < 0)
-        goto cleanup;
-
-    if (cfg->autoballoon && libxlDomainFreeMem(cfg->ctx, &d_config) < 0)
-        goto cleanup;
-
-    if (virHostdevPrepareDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
-                                       vm->def, VIR_HOSTDEV_SP_PCI) < 0)
-        goto cleanup;
-
     if (virDomainLockProcessStart(driver->lockManager,
                                   "xen:///system",
                                   vm,
@@ -1061,6 +1050,17 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
         goto cleanup;
     VIR_FREE(priv->lockState);
 
+    if (libxlBuildDomainConfig(driver->reservedGraphicsPorts, vm->def,
+                               cfg->ctx, &d_config) < 0)
+        goto cleanup_dom;
+
+    if (cfg->autoballoon && libxlDomainFreeMem(cfg->ctx, &d_config) < 0)
+        goto cleanup_dom;
+
+    if (virHostdevPrepareDomainDevices(hostdev_mgr, LIBXL_DRIVER_NAME,
+                                       vm->def, VIR_HOSTDEV_SP_PCI) < 0)
+        goto cleanup_dom;
+
     /* Unlock virDomainObj while creating the domain */
     virObjectUnlock(vm);
 
@@ -1091,7 +1091,7 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
             virReportError(VIR_ERR_INTERNAL_ERROR,
                            _("libxenlight failed to restore domain '%s'"),
                            d_config.c_info.name);
-        goto release_dom;
+        goto cleanup_dom;
     }
 
     /*
@@ -1152,8 +1152,8 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
     vm->def->id = -1;
     virDomainObjSetState(vm, VIR_DOMAIN_SHUTOFF, VIR_DOMAIN_SHUTOFF_FAILED);
 
- release_dom:
-    virDomainLockProcessPause(driver->lockManager, vm, &priv->lockState);
+ cleanup_dom:
+    libxlDomainCleanup(driver, vm);
 
  cleanup:
     libxl_domain_config_dispose(&d_config);