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Bluetooth: Handle bt_accept_enqueue() socket atomically 

There is a small risk that bt_accept_unlink() runs concurrently with
bt_accept_enqueue() on the same socket. This scenario could potentially
lead to a NULL pointer dereference of the socket's parent member because
the socket can be on the list but the socket's parent member is not yet
updated by bt_accept_enqueue().

Therefore, add socket locking inside bt_accept_enqueue() so that the
socket is added to the list AND the parent's socket address is set in the
socket's parent member. The socket locking ensures that the socket is on
the list with a valid non-NULL parent member.

Signed-off-by: Dean Jenkins <Dean_Jenkins@mentor.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Dean Jenkins 2017-03-10 11:34:45 +00:00 committed by Marcel Holtmann
parent 459848564f
commit e163376220
1 changed files with 2 additions and 0 deletions
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2
net/bluetooth/af_bluetooth.c
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@ -159,8 +159,10 @@ void bt_accept_enqueue(struct sock *parent, struct sock *sk)
BT_DBG("parent %p, sk %p", parent, sk);
sock_hold(sk);
lock_sock(sk);
list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
bt_sk(sk)->parent = parent;
release_sock(sk);
parent->sk_ack_backlog++;
}
EXPORT_SYMBOL(bt_accept_enqueue);