Bluetooth: Hold socket in defer callback in L2CAP socket
In both places that we use the defer callback the socket lock is held for
a indirect sk access inside __l2cap_change_state() and chan->ops->defer(),
all the rest of the code between lock_sock() and release_sock() is
already protected by the channel lock and won't be affected by this
change.
We now use l2cap_change_state(), the locked version of the change state
function, and the defer callback does the locking itself now. This does
not affect other uses of the defer callback.
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
diff --git a/net/bluetooth/l2cap_core.c b/net/bluetooth/l2cap_core.c
index 4141545..049e1c8 100644
--- a/net/bluetooth/l2cap_core.c
+++ b/net/bluetooth/l2cap_core.c
@@ -1299,20 +1299,16 @@
rsp.dcid = cpu_to_le16(chan->scid);
if (l2cap_chan_check_security(chan)) {
- struct sock *sk = chan->sk;
-
- lock_sock(sk);
if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHOR_PEND);
chan->ops->defer(chan);
} else {
- __l2cap_state_change(chan, BT_CONFIG);
+ l2cap_state_change(chan, BT_CONFIG);
rsp.result = __constant_cpu_to_le16(L2CAP_CR_SUCCESS);
rsp.status = __constant_cpu_to_le16(L2CAP_CS_NO_INFO);
}
- release_sock(sk);
} else {
rsp.result = __constant_cpu_to_le16(L2CAP_CR_PEND);
rsp.status = __constant_cpu_to_le16(L2CAP_CS_AUTHEN_PEND);
@@ -6643,31 +6639,26 @@
__set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
}
} else if (chan->state == BT_CONNECT2) {
- struct sock *sk = chan->sk;
struct l2cap_conn_rsp rsp;
__u16 res, stat;
- lock_sock(sk);
-
if (!status) {
if (test_bit(FLAG_DEFER_SETUP, &chan->flags)) {
res = L2CAP_CR_PEND;
stat = L2CAP_CS_AUTHOR_PEND;
chan->ops->defer(chan);
} else {
- __l2cap_state_change(chan, BT_CONFIG);
+ l2cap_state_change(chan, BT_CONFIG);
res = L2CAP_CR_SUCCESS;
stat = L2CAP_CS_NO_INFO;
}
} else {
- __l2cap_state_change(chan, BT_DISCONN);
+ l2cap_state_change(chan, BT_DISCONN);
__set_chan_timer(chan, L2CAP_DISC_TIMEOUT);
res = L2CAP_CR_SEC_BLOCK;
stat = L2CAP_CS_NO_INFO;
}
- release_sock(sk);
-
rsp.scid = cpu_to_le16(chan->dcid);
rsp.dcid = cpu_to_le16(chan->scid);
rsp.result = cpu_to_le16(res);
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index a0b31db..e559992 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1195,11 +1195,15 @@
static void l2cap_sock_defer_cb(struct l2cap_chan *chan)
{
- struct sock *sk = chan->data;
- struct sock *parent = bt_sk(sk)->parent;
+ struct sock *parent, *sk = chan->data;
+ lock_sock(sk);
+
+ parent = bt_sk(sk)->parent;
if (parent)
parent->sk_data_ready(parent, 0);
+
+ release_sock(sk);
}
static void l2cap_sock_resume_cb(struct l2cap_chan *chan)