Bluetooth: Fix locking in bt_accept_enqueue() for BH context

With commit e16337622016 ("Bluetooth: Handle bt_accept_enqueue() socket
atomically") lock_sock[_nested]() is used to acquire the socket lock
before manipulating the socket. lock_sock[_nested]() may block, which
is problematic since bt_accept_enqueue() can be called in bottom half
context (e.g. from rfcomm_connect_ind()):

[<ffffff80080d81ec>] __might_sleep+0x4c/0x80
[<ffffff800876c7b0>] lock_sock_nested+0x24/0x58
[<ffffff8000d7c27c>] bt_accept_enqueue+0x48/0xd4 [bluetooth]
[<ffffff8000e67d8c>] rfcomm_connect_ind+0x190/0x218 [rfcomm]

Add a parameter to bt_accept_enqueue() to indicate whether the
function is called from BH context, and acquire the socket lock
with bh_lock_sock_nested() if that's the case.

Also adapt all callers of bt_accept_enqueue() to pass the new
parameter:

- l2cap_sock_new_connection_cb()
  - uses lock_sock() to lock the parent socket => process context

- rfcomm_connect_ind()
  - acquires the parent socket lock with bh_lock_sock() => BH
    context

- __sco_chan_add()
  - called from sco_chan_add(), which is called from sco_connect().
    parent is NULL, hence bt_accept_enqueue() isn't called in this
    code path and we can ignore it
  - also called from sco_conn_ready(). uses bh_lock_sock() to acquire
    the parent lock => BH context

Fixes: e16337622016 ("Bluetooth: Handle bt_accept_enqueue() socket atomically")
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Cc: stable@vger.kernel.org

5 files changed, 17 insertions, 7 deletions

diff --git a/include/net/bluetooth/bluetooth.h b/include/net/bluetooth/bluetooth.h
index ec9d6bc65855..fabee6db0abb 100644
--- a/include/net/bluetooth/bluetooth.h
+++ b/include/net/bluetooth/bluetooth.h
@@ -276,7 +276,7 @@ int  bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
 int  bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo);
 int  bt_sock_wait_ready(struct sock *sk, unsigned long flags);
 
-void bt_accept_enqueue(struct sock *parent, struct sock *sk);
+void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh);
 void bt_accept_unlink(struct sock *sk);
 struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock);
 
diff --git a/net/bluetooth/af_bluetooth.c b/net/bluetooth/af_bluetooth.c
index deacc52d7ff1..8d12198eaa94 100644
--- a/net/bluetooth/af_bluetooth.c
+++ b/net/bluetooth/af_bluetooth.c
@@ -154,15 +154,25 @@ void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
 }
 EXPORT_SYMBOL(bt_sock_unlink);
 
-void bt_accept_enqueue(struct sock *parent, struct sock *sk)
+void bt_accept_enqueue(struct sock *parent, struct sock *sk, bool bh)
 {
         BT_DBG("parent %p, sk %p", parent, sk);
 
         sock_hold(sk);
-        lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
+        if (bh)
+                bh_lock_sock_nested(sk);
+        else
+                lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
+
         list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
         bt_sk(sk)->parent = parent;
-        release_sock(sk);
+
+        if (bh)
+                bh_unlock_sock(sk);
+        else
+                release_sock(sk);
+
         parent->sk_ack_backlog++;
 }
 EXPORT_SYMBOL(bt_accept_enqueue);
diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 686bdc6b35b0..a3a2cd55e23a 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1252,7 +1252,7 @@ static struct l2cap_chan *l2cap_sock_new_connection_cb(struct l2cap_chan *chan)
 
         l2cap_sock_init(sk, parent);
 
-        bt_accept_enqueue(parent, sk);
+        bt_accept_enqueue(parent, sk, false);
 
         release_sock(parent);
 
diff --git a/net/bluetooth/rfcomm/sock.c b/net/bluetooth/rfcomm/sock.c
index aa0db1d1bd9b..b1f49fcc0478 100644
--- a/net/bluetooth/rfcomm/sock.c
+++ b/net/bluetooth/rfcomm/sock.c
@@ -988,7 +988,7 @@ int rfcomm_connect_ind(struct rfcomm_session *s, u8 channel, struct rfcomm_dlc *
         rfcomm_pi(sk)->channel = channel;
 
         sk->sk_state = BT_CONFIG;
-        bt_accept_enqueue(parent, sk);
+        bt_accept_enqueue(parent, sk, true);
 
         /* Accept connection and return socket DLC */
         *d = rfcomm_pi(sk)->dlc;
diff --git a/net/bluetooth/sco.c b/net/bluetooth/sco.c
index 529b38996d8b..9a580999ca57 100644
--- a/net/bluetooth/sco.c
+++ b/net/bluetooth/sco.c
@@ -193,7 +193,7 @@ static void __sco_chan_add(struct sco_conn *conn, struct sock *sk,
         conn->sk = sk;
 
         if (parent)
-                bt_accept_enqueue(parent, sk);
+                bt_accept_enqueue(parent, sk, true);
 }
 
 static int sco_chan_add(struct sco_conn *conn, struct sock *sk,