Commit 8d12356f authored by David Herrmann's avatar David Herrmann Committed by Gustavo Padovan
Browse files

Bluetooth: introduce hci_conn ref-counting 



We currently do not allow using hci_conn from outside of HCI-core.
However, several other users could make great use of it. This includes
HIDP, rfcomm and all other sub-protocols that rely on an active
connection.

Hence, we now introduce hci_conn ref-counting. We currently never call
get_device(). put_device() is exclusively used in hci_conn_del_sysfs().
Hence, we currently never have a greater device-refcnt than 1.
Therefore, it is safe to move the put_device() call from
hci_conn_del_sysfs() to hci_conn_del() (it's the only caller). In fact,
this even fixes a "use-after-free" bug as we access hci_conn after calling
hci_conn_del_sysfs() in hci_conn_del().

From now on we can add references to hci_conn objects in other layers
(like l2cap_sock, HIDP, rfcomm, ...) and grab a reference via
hci_conn_get(). This does _not_ guarantee, that the connection is still
alive. But, this isn't what we want. We can simply lock the hci_conn
device and use "device_is_registered(hci_conn->dev)" to test that.
However, this is hardly necessary as outside users should never rely on
the HCI connection to be alive, anyway. Instead, they should solely rely
on the device-object to be available.
But if sub-devices want the hci_conn object as sysfs parent, they need to
be notified when the connection drops. This will be introduced in later
patches with l2cap_users.

Signed-off-by: default avatarDavid Herrmann <dh.herrmann@gmail.com>
Acked-by: default avatarMarcel Holtmann <marcel@holtmann.org>
Signed-off-by: default avatarGustavo Padovan <gustavo.padovan@collabora.co.uk>
parent fc225c3f

include/net/bluetooth/hci_core.h

+31 −0
Original line number Diff line number Diff line
@@ -600,6 +600,37 @@ int hci_conn_switch_role(struct hci_conn *conn, __u8 role); 


void hci_conn_enter_active_mode(struct hci_conn *conn, __u8 force_active);



/*

 * hci_conn_get() and hci_conn_put() are used to control the life-time of an

 * "hci_conn" object. They do not guarantee that the hci_conn object is running,

 * working or anything else. They just guarantee that the object is available

 * and can be dereferenced. So you can use its locks, local variables and any

 * other constant data.

 * Before accessing runtime data, you _must_ lock the object and then check that

 * it is still running. As soon as you release the locks, the connection might

 * get dropped, though.

 *

 * On the other hand, hci_conn_hold() and hci_conn_drop() are used to control

 * how long the underlying connection is held. So every channel that runs on the

 * hci_conn object calls this to prevent the connection from disappearing. As

 * long as you hold a device, you must also guarantee that you have a valid

 * reference to the device via hci_conn_get() (or the initial reference from

 * hci_conn_add()).

 * The hold()/drop() ref-count is known to drop below 0 sometimes, which doesn't

 * break because nobody cares for that. But this means, we cannot use

 * _get()/_drop() in it, but require the caller to have a valid ref (FIXME).

 */



static inline void hci_conn_get(struct hci_conn *conn)

{

	get_device(&conn->dev);

}



static inline void hci_conn_put(struct hci_conn *conn)

{

	put_device(&conn->dev);

}



static inline void hci_conn_hold(struct hci_conn *conn)

{

	BT_DBG("hcon %p orig refcnt %d", conn, atomic_read(&conn->refcnt));

net/bluetooth/hci_conn.c

+1 −2
Original line number Diff line number Diff line
@@ -462,8 +462,7 @@ int hci_conn_del(struct hci_conn *conn) 


	hci_dev_put(hdev);



	if (conn->handle == 0)

		kfree(conn);

	hci_conn_put(conn);



	return 0;

}

net/bluetooth/hci_sysfs.c

+0 −1
Original line number Diff line number Diff line
@@ -146,7 +146,6 @@ void hci_conn_del_sysfs(struct hci_conn *conn) 
	}



	device_del(&conn->dev);

	put_device(&conn->dev);



	hci_dev_put(hdev);

}

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