提交 74da626a 编写于 作者: M Marcel Holtmann 提交者: David S. Miller

[Bluetooth] Add locking for bt_proto array manipulation

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: NMasatake YAMATO <jet@gyve.org>
Signed-off-by: NFrederik Deweerdt <frederik.deweerdt@gmail.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>
上级 cb19d9ea
......@@ -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;
write_lock(&bt_proto_lock);
if (bt_proto[proto])
return -EEXIST;
err = -EEXIST;
else
bt_proto[proto] = ops;
bt_proto[proto] = ops;
return 0;
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;
write_lock(&bt_proto_lock);
if (!bt_proto[proto])
return -ENOENT;
err = -ENOENT;
else
bt_proto[proto] = NULL;
bt_proto[proto] = NULL;
return 0;
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;
}
......
......@@ -214,7 +214,7 @@ static int bnep_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &bnep_proto, 1);
sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &bnep_proto, 1);
if (!sk)
return -ENOMEM;
......
......@@ -205,7 +205,7 @@ static int cmtp_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &cmtp_proto, 1);
sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &cmtp_proto, 1);
if (!sk)
return -ENOMEM;
......
......@@ -618,7 +618,7 @@ static int hci_sock_create(struct socket *sock, int protocol)
sock->ops = &hci_sock_ops;
sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hci_sk_proto, 1);
sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &hci_sk_proto, 1);
if (!sk)
return -ENOMEM;
......
......@@ -256,7 +256,7 @@ static int hidp_sock_create(struct socket *sock, int protocol)
if (sock->type != SOCK_RAW)
return -ESOCKTNOSUPPORT;
sk = sk_alloc(PF_BLUETOOTH, GFP_KERNEL, &hidp_proto, 1);
sk = sk_alloc(PF_BLUETOOTH, GFP_ATOMIC, &hidp_proto, 1);
if (!sk)
return -ENOMEM;
......
......@@ -559,7 +559,7 @@ static int l2cap_sock_create(struct socket *sock, int protocol)
sock->ops = &l2cap_sock_ops;
sk = l2cap_sock_alloc(sock, protocol, GFP_KERNEL);
sk = l2cap_sock_alloc(sock, protocol, GFP_ATOMIC);
if (!sk)
return -ENOMEM;
......
......@@ -336,7 +336,8 @@ static int rfcomm_sock_create(struct socket *sock, int protocol)
sock->ops = &rfcomm_sock_ops;
if (!(sk = rfcomm_sock_alloc(sock, protocol, GFP_KERNEL)))
sk = rfcomm_sock_alloc(sock, protocol, GFP_ATOMIC);
if (!sk)
return -ENOMEM;
rfcomm_sock_init(sk, NULL);
......
......@@ -452,7 +452,8 @@ static int sco_sock_create(struct socket *sock, int protocol)
sock->ops = &sco_sock_ops;
if (!(sk = sco_sock_alloc(sock, protocol, GFP_KERNEL)))
sk = sco_sock_alloc(sock, protocol, GFP_ATOMIC);
if (!sk)
return -ENOMEM;
sco_sock_init(sk, NULL);
......
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