tty: hvc_xen: NULL dereference on allocation failure

If kzalloc() returns a NULL here, we pass a NULL to
xencons_disconnect_backend() which will cause an Oops.

Also I removed the __GFP_ZERO while I was at it since kzalloc() implies
__GFP_ZERO.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 2 insertions, 2 deletions

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index 83d5c88e7165..d3d91dae065c 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -430,9 +430,9 @@ static int __devinit xencons_probe(struct xenbus_device *dev,
         if (devid == 0)
                 return -ENODEV;
 
-        info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL | __GFP_ZERO);
+        info = kzalloc(sizeof(struct xencons_info), GFP_KERNEL);
         if (!info)
-                goto error_nomem;
+                return -ENOMEM;
         dev_set_drvdata(&dev->dev, info);
         info->xbdev = dev;
         info->vtermno = xenbus_devid_to_vtermno(devid);