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authorLogan Gunthorpe <logang@deltatee.com>2017-03-17 18:48:20 (GMT)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-03-21 05:44:33 (GMT)
commitdbef390d2eb0a7b0a6be21381a326d4e13953aba (patch)
tree959cf65e5592d2d397f92eef4141f70bf200860f /drivers/rapidio
parent493cfaeaa0c9bc0c79ce5751193d49fdac9aaaec (diff)
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>
Diffstat (limited to 'drivers/rapidio')
-rw-r--r--drivers/rapidio/devices/rio_mport_cdev.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/rapidio/devices/rio_mport_cdev.c b/drivers/rapidio/devices/rio_mport_cdev.c
index 50b617af..5beb0c3 100644
--- a/drivers/rapidio/devices/rio_mport_cdev.c
+++ b/drivers/rapidio/devices/rio_mport_cdev.c
@@ -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);
}

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