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[Bluetooth] Add locking for bt_proto array manipulation

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The bt_proto array needs to be protected by some kind of locking to
prevent a race condition between bt_sock_create and bt_sock_register.

And in addition all calls to sk_alloc need to be made GFP_ATOMIC now.

Signed-off-by: Masatake YAMATO <jet@gyve.org>
Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Marcel Holtmann
2006-10-15 17:31:14 +02:00
committed by David S. Miller
parent cb19d9ea2c
commit 74da626a10
8 changed files with 40 additions and 16 deletions
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40
net/bluetooth/af_bluetooth.c
View File

@@ -53,36 +53,51 @@
/* Bluetooth sockets */
#define BT_MAX_PROTO 8
static struct net_proto_family *bt_proto[BT_MAX_PROTO];
static DEFINE_RWLOCK(bt_proto_lock);
int bt_sock_register(int proto, struct net_proto_family *ops)
{
int err = 0;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
if (bt_proto[proto])
return -EEXIST;
write_lock(&bt_proto_lock);
bt_proto[proto] = ops;
return 0;
if (bt_proto[proto])
err = -EEXIST;
else
bt_proto[proto] = ops;
write_unlock(&bt_proto_lock);
return err;
}
EXPORT_SYMBOL(bt_sock_register);
int bt_sock_unregister(int proto)
{
int err = 0;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
if (!bt_proto[proto])
return -ENOENT;
write_lock(&bt_proto_lock);
bt_proto[proto] = NULL;
return 0;
if (!bt_proto[proto])
err = -ENOENT;
else
bt_proto[proto] = NULL;
write_unlock(&bt_proto_lock);
return err;
}
EXPORT_SYMBOL(bt_sock_unregister);
static int bt_sock_create(struct socket *sock, int proto)
{
int err = 0;
int err;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
@@ -92,11 +107,18 @@ static int bt_sock_create(struct socket *sock, int proto)
request_module("bt-proto-%d", proto);
}
#endif
err = -EPROTONOSUPPORT;
read_lock(&bt_proto_lock);
if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
err = bt_proto[proto]->create(sock, proto);
module_put(bt_proto[proto]->owner);
}
read_unlock(&bt_proto_lock);
return err;
}