[tpmdd-devel,13/14] scsi: utilize new device_add_cdev helper function

Submitted by Logan Gunthorpe on Feb. 21, 2017, 5 a.m.

Details

Message ID 1487653253-11497-14-git-send-email-logang@deltatee.com
State New
Headers show

Commit Message

Logan Gunthorpe Feb. 21, 2017, 5 a.m.
Note: the chardev instance in osd_uld.c originally did not
set the kobject parent. Thus, I'm reasonably confident that because
of this, this code  would have suffered from a minor use after free
bug if the cdev was open when the backing device was released.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
---
 drivers/scsi/osd/osd_uld.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

Patch hide | download patch | download mbox

diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c
index 243eab3..519be56 100644
--- a/drivers/scsi/osd/osd_uld.c
+++ b/drivers/scsi/osd/osd_uld.c
@@ -473,18 +473,19 @@  static int osd_probe(struct device *dev)
 		goto err_put_disk;
 	}
 
+	device_initialize(&oud->class_dev);
+	oud->class_dev.devt = MKDEV(SCSI_OSD_MAJOR, oud->minor);
+
 	/* init the char-device for communication with user-mode */
 	cdev_init(&oud->cdev, &osd_fops);
 	oud->cdev.owner = THIS_MODULE;
-	error = cdev_add(&oud->cdev,
-			 MKDEV(SCSI_OSD_MAJOR, oud->minor), 1);
+	error = device_add_cdev(&oud->class_dev, &oud->cdev);
 	if (error) {
 		OSD_ERR("cdev_add failed\n");
 		goto err_put_disk;
 	}
 
 	/* class device member */
-	oud->class_dev.devt = oud->cdev.dev;
 	oud->class_dev.class = &osd_uld_class;
 	oud->class_dev.parent = dev;
 	oud->class_dev.release = __remove;
@@ -494,7 +495,7 @@  static int osd_probe(struct device *dev)
 		goto err_put_cdev;
 	}
 
-	error = device_register(&oud->class_dev);
+	error = device_add(&oud->class_dev);
 	if (error) {
 		OSD_ERR("device_register failed => %d\n", error);
 		goto err_put_cdev;