Commit bcb4a75b authored by Alexey Khoroshilov's avatar Alexey Khoroshilov Committed by Jiri Kosina

HID: hidraw: improve error handling in hidraw_init()

Several improvements in error handling:
- do not report success if alloc_chrdev_region() failed
- check for error code of cdev_add()
- use unregister_chrdev_region() instead of unregister_chrdev()
  if class_create() failed

Found by Linux Driver Verification project (linuxtesting.org).
Signed-off-by: default avatarAlexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
parent 2843b673
......@@ -559,21 +559,28 @@ int __init hidraw_init(void)
if (result < 0) {
pr_warn("can't get major number\n");
result = 0;
goto out;
}
hidraw_class = class_create(THIS_MODULE, "hidraw");
if (IS_ERR(hidraw_class)) {
result = PTR_ERR(hidraw_class);
unregister_chrdev(hidraw_major, "hidraw");
goto out;
goto error_cdev;
}
cdev_init(&hidraw_cdev, &hidraw_ops);
cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
result = cdev_add(&hidraw_cdev, dev_id, HIDRAW_MAX_DEVICES);
if (result < 0)
goto error_class;
out:
return result;
error_class:
class_destroy(hidraw_class);
error_cdev:
unregister_chrdev_region(dev_id, HIDRAW_MAX_DEVICES);
goto out;
}
void hidraw_exit(void)
......
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