[PATCH] tty: vcc: Add check for kstrdup() in vcc_probe()

[Yi Yang <yiyang13@huawei.com>]

Add check for the return value of kstrdup() and return the error, if it
fails in order to avoid NULL pointer dereference.

Fixes: 5d171050e28f ("sparc64: vcc: Enable VCC port probe and removal")
Signed-off-by: Yi Yang <yiyang13@huawei.com>
---
 drivers/tty/vcc.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/tty/vcc.c b/drivers/tty/vcc.c
index a39ed981bfd3..420d334f6077 100644
--- a/drivers/tty/vcc.c
+++ b/drivers/tty/vcc.c
@@ -579,6 +579,10 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 		return -ENOMEM;
 
 	name = kstrdup(dev_name(&vdev->dev), GFP_KERNEL);
+	if (!name) {
+		kfree(port);
+		return -ENOMEM;
+	}
 
 	rv = vio_driver_init(&port->vio, vdev, VDEV_CONSOLE_CON, vcc_versions,
 			     ARRAY_SIZE(vcc_versions), NULL, name);
@@ -624,6 +628,11 @@ static int vcc_probe(struct vio_dev *vdev, const struct vio_device_id *id)
 		goto unreg_tty;
 	}
 	port->domain = kstrdup(domain, GFP_KERNEL);
+	if (!port->domain) {
+		rv = -ENOMEM;
+		goto unreg_tty;
+	}
+
 
 	mdesc_release(hp);
 
-- 
2.17.1