From c66e344e38269227c93e598f599108a65b066fc0 Mon Sep 17 00:00:00 2001
From: Jim Fehlig <jfehlig@suse.com>
Date: Fri, 16 Mar 2018 15:00:17 -0600
Subject: [PATCH] libxl: dont dereference NULL libxlDomainObjPrivatePtr

In libxlDomainMigrationPrepare it is possible to dereference a NULL
libxlDomainObjPrivatePtr in early error paths. Check for a valid
'priv' before using it.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>
---
 src/libxl/libxl_migration.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/libxl/libxl_migration.c b/src/libxl/libxl_migration.c
index 324a1adde9..59de0b2785 100644
--- a/src/libxl/libxl_migration.c
+++ b/src/libxl/libxl_migration.c
@@ -804,9 +804,10 @@ libxlDomainMigrationPrepare(virConnectPtr dconn,
     }
     VIR_FREE(socks);
     virObjectUnref(args);
-    virPortAllocatorRelease(priv->migrationPort);
-    priv->migrationPort = 0;
-
+    if (priv) {
+        virPortAllocatorRelease(priv->migrationPort);
+        priv->migrationPort = 0;
+    }
     /* Remove virDomainObj from domain list */
     if (vm) {
         virDomainObjListRemove(driver->domains, vm);