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rapidio: utilize new cdev_device_add helper function 

This driver did not originally set kobj.parent so it likely had
potential a use after free bug which this patch fixes.

We convert from device_register to device_initialize/cdev_device_add.
While we are at it we use put_device instead of kfree (as recommended
by the device_initialize documentation). We also remove an unnecessary
extra get_device from the code.

Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Logan Gunthorpe 2017-03-17 12:48:20 -06:00 committed by Greg Kroah-Hartman
parent 493cfaeaa0
commit dbef390d2e
1 changed files with 8 additions and 16 deletions
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24
drivers/rapidio/devices/rio_mport_cdev.c
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@ -2444,31 +2444,25 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
mutex_init(&md->buf_mutex);
mutex_init(&md->file_mutex);
INIT_LIST_HEAD(&md->file_list);
cdev_init(&md->cdev, &mport_fops);
md->cdev.owner = THIS_MODULE;
ret = cdev_add(&md->cdev, MKDEV(MAJOR(dev_number), mport->id), 1);
if (ret < 0) {
kfree(md);
rmcd_error("Unable to register a device, err=%d", ret);
return NULL;
}
md->dev.devt = md->cdev.dev;
device_initialize(&md->dev);
md->dev.devt = MKDEV(MAJOR(dev_number), mport->id);
md->dev.class = dev_class;
md->dev.parent = &mport->dev;
md->dev.release = mport_device_release;
dev_set_name(&md->dev, DEV_NAME "%d", mport->id);
atomic_set(&md->active, 1);
ret = device_register(&md->dev);
cdev_init(&md->cdev, &mport_fops);
md->cdev.owner = THIS_MODULE;
ret = cdev_device_add(&md->cdev, &md->dev);
if (ret) {
rmcd_error("Failed to register mport %d (err=%d)",
mport->id, ret);
goto err_cdev;
}
get_device(&md->dev);
INIT_LIST_HEAD(&md->doorbells);
spin_lock_init(&md->db_lock);
INIT_LIST_HEAD(&md->portwrites);
@ -2513,8 +2507,7 @@ static struct mport_dev *mport_cdev_add(struct rio_mport *mport)
return md;
err_cdev:
cdev_del(&md->cdev);
kfree(md);
put_device(&md->dev);
return NULL;
}
@ -2578,7 +2571,7 @@ static void mport_cdev_remove(struct mport_dev *md)
atomic_set(&md->active, 0);
mport_cdev_terminate_dma(md);
rio_del_mport_pw_handler(md->mport, md, rio_mport_pw_handler);
cdev_del(&(md->cdev));
cdev_device_del(&md->cdev, &md->dev);
mport_cdev_kill_fasync(md);
flush_workqueue(dma_wq);
@ -2603,7 +2596,6 @@ static void mport_cdev_remove(struct mport_dev *md)
rio_release_inb_dbell(md->mport, 0, 0x0fff);
device_unregister(&md->dev);
put_device(&md->dev);
}