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NFC: fix broken device allocation 

Commit 7eda8b8e96 ("NFC: Use IDR library to assing NFC devices IDs")
moved device-id allocation and struct-device initialisation from
nfc_allocate_device() to nfc_register_device().

This broke just about every nfc-device-registration error path, which
continue to call nfc_free_device() that tries to put the device
reference of the now uninitialised (but zeroed) struct device:

kobject: '(null)' (ce316420): is not initialized, yet kobject_put() is being called.

The late struct-device initialisation also meant that various work
queues whose names are derived from the nfc device name were also
misnamed:

  421 root         0 SW<  [(null)_nci_cmd_]
  422 root         0 SW<  [(null)_nci_rx_w]
  423 root         0 SW<  [(null)_nci_tx_w]

Move the id-allocation and struct-device initialisation back to
nfc_allocate_device() and fix up the single call site which did not use
nfc_free_device() in its error path.

Fixes: 7eda8b8e96 ("NFC: Use IDR library to assing NFC devices IDs")
Cc: stable <stable@vger.kernel.org>     # 3.8
Cc: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Johan Hovold 2017-03-30 12:15:35 +02:00 committed by Samuel Ortiz
parent e2f0f67108
commit 20777bc57c
2 changed files with 19 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
net/nfc/core.c
View File

@ -982,6 +982,8 @@ static void nfc_release(struct device *d)
kfree(se);
}
ida_simple_remove(&nfc_index_ida, dev->idx);
kfree(dev);
}
@ -1056,6 +1058,7 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
int tx_headroom, int tx_tailroom)
{
struct nfc_dev *dev;
int rc;
if (!ops->start_poll || !ops->stop_poll || !ops->activate_target ||
!ops->deactivate_target || !ops->im_transceive)
@ -1068,6 +1071,15 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
if (!dev)
return NULL;
rc = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
if (rc < 0)
goto err_free_dev;
dev->idx = rc;
dev->dev.class = &nfc_class;
dev_set_name(&dev->dev, "nfc%d", dev->idx);
device_initialize(&dev->dev);
dev->ops = ops;
dev->supported_protocols = supported_protocols;
dev->tx_headroom = tx_headroom;
@ -1090,6 +1102,11 @@ struct nfc_dev *nfc_allocate_device(struct nfc_ops *ops,
}
return dev;
err_free_dev:
kfree(dev);
return ERR_PTR(rc);
}
EXPORT_SYMBOL(nfc_allocate_device);
@ -1104,14 +1121,6 @@ int nfc_register_device(struct nfc_dev *dev)
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
dev->idx = ida_simple_get(&nfc_index_ida, 0, 0, GFP_KERNEL);
if (dev->idx < 0)
return dev->idx;
dev->dev.class = &nfc_class;
dev_set_name(&dev->dev, "nfc%d", dev->idx);
device_initialize(&dev->dev);
mutex_lock(&nfc_devlist_mutex);
nfc_devlist_generation++;
rc = device_add(&dev->dev);
@ -1149,12 +1158,10 @@ EXPORT_SYMBOL(nfc_register_device);
*/
void nfc_unregister_device(struct nfc_dev *dev)
{
int rc, id;
int rc;
pr_debug("dev_name=%s\n", dev_name(&dev->dev));
id = dev->idx;
if (dev->rfkill) {
rfkill_unregister(dev->rfkill);
rfkill_destroy(dev->rfkill);
@ -1179,8 +1186,6 @@ void nfc_unregister_device(struct nfc_dev *dev)
nfc_devlist_generation++;
device_del(&dev->dev);
mutex_unlock(&nfc_devlist_mutex);
ida_simple_remove(&nfc_index_ida, id);
}
EXPORT_SYMBOL(nfc_unregister_device);

3
net/nfc/nci/core.c
View File

@ -1173,8 +1173,7 @@ struct nci_dev *nci_allocate_device(struct nci_ops *ops,
return ndev;
free_nfc:
kfree(ndev->nfc_dev);
nfc_free_device(ndev->nfc_dev);
free_nci:
kfree(ndev);
return NULL;