xen/acpi: Fix potential memory leak.

Coverity points out that we do not free in one case the
pr_backup - and sure enough we forgot.

Found by Coverity (CID 401970)

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/xen/xen-acpi-processor.c b/drivers/xen/xen-acpi-processor.c
index 7ff2569e17ae..b590ee067fcd 100644
--- a/drivers/xen/xen-acpi-processor.c
+++ b/drivers/xen/xen-acpi-processor.c
@@ -520,15 +520,18 @@ static int __init xen_acpi_processor_init(void)
 
                 if (!pr_backup) {
                         pr_backup = kzalloc(sizeof(struct acpi_processor), GFP_KERNEL);
-                        memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
+                        if (pr_backup)
+                                memcpy(pr_backup, _pr, sizeof(struct acpi_processor));
                 }
                 (void)upload_pm_data(_pr);
         }
         rc = check_acpi_ids(pr_backup);
-        if (rc)
-                goto err_unregister;
 
         kfree(pr_backup);
+        pr_backup = NULL;
+
+        if (rc)
+                goto err_unregister;
 
         return 0;
 err_unregister: