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Subject[PATCH 20/24] Bluetooth: Cleanup RFCOMM device registration error handling
Date
If RFCOMM tty device registration fails, cleanup by releasing
the tty_port reference to trigger rfcomm_dev destruction
(rather than open-coding it).

The dlc reference release is moved into rfcomm_dev_add(),
which ensures cleanup in both error paths -- ie., if
__rfcomm_dev_add() fails or if tty_port_register_device() fails.

Fixes releasing the module reference if device registration fails.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
---
net/bluetooth/rfcomm/tty.c | 16 +++++++---------
1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/net/bluetooth/rfcomm/tty.c b/net/bluetooth/rfcomm/tty.c
index 0537a05..375b60d 100644
--- a/net/bluetooth/rfcomm/tty.c
+++ b/net/bluetooth/rfcomm/tty.c
@@ -93,7 +93,8 @@ static void rfcomm_dev_destruct(struct tty_port *port)

rfcomm_dlc_put(dlc);

- tty_unregister_device(rfcomm_tty_driver, dev->id);
+ if (dev->tty_dev)
+ tty_unregister_device(rfcomm_tty_driver, dev->id);

spin_lock(&rfcomm_dev_lock);
list_del(&dev->list);
@@ -317,16 +318,15 @@ static int rfcomm_dev_add(struct rfcomm_dev_req *req, struct rfcomm_dlc *dlc)
BT_DBG("id %d channel %d", req->dev_id, req->channel);

dev = __rfcomm_dev_add(req, dlc);
- if (IS_ERR(dev))
+ if (IS_ERR(dev)) {
+ rfcomm_dlc_put(dlc);
return PTR_ERR(dev);
+ }

tty = tty_port_register_device(&dev->port, rfcomm_tty_driver,
dev->id, NULL);
if (IS_ERR(tty)) {
- spin_lock(&rfcomm_dev_lock);
- list_del(&dev->list);
- spin_unlock(&rfcomm_dev_lock);
- kfree(dev);
+ tty_port_put(&dev->port);
return PTR_ERR(tty);
}

@@ -420,10 +420,8 @@ static int __rfcomm_create_dev(struct sock *sk, void __user *arg)
}

id = rfcomm_dev_add(&req, dlc);
- if (id < 0) {
- rfcomm_dlc_put(dlc);
+ if (id < 0)
return id;
- }

if (req.flags & (1 << RFCOMM_REUSE_DLC)) {
/* DLC is now used by device.
--
1.8.1.2


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