| From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.16 001/217] Bluetooth: hci_sock: purge socket queues in the destruct() callback | Date | Mon, 17 Jan 2022 21:16:04 -0500 |
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From: Nguyen Dinh Phi <phind.uet@gmail.com>
[ Upstream commit 709fca500067524381e28a5f481882930eebac88 ]
The receive path may take the socket right before hci_sock_release(), but it may enqueue the packets to the socket queues after the call to skb_queue_purge(), therefore the socket can be destroyed without clear its queues completely.
Moving these skb_queue_purge() to the hci_sock_destruct() will fix this issue, because nothing is referencing the socket at this point.
Signed-off-by: Nguyen Dinh Phi <phind.uet@gmail.com> Reported-by: syzbot+4c4ffd1e1094dae61035@syzkaller.appspotmail.com Signed-off-by: Marcel Holtmann <marcel@holtmann.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- net/bluetooth/hci_sock.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c index d0dad1fafe079..446573a125711 100644 --- a/net/bluetooth/hci_sock.c +++ b/net/bluetooth/hci_sock.c @@ -889,10 +889,6 @@ static int hci_sock_release(struct socket *sock) } sock_orphan(sk); - - skb_queue_purge(&sk->sk_receive_queue); - skb_queue_purge(&sk->sk_write_queue); - release_sock(sk); sock_put(sk); return 0; @@ -2058,6 +2054,12 @@ static int hci_sock_getsockopt(struct socket *sock, int level, int optname, return err; } +static void hci_sock_destruct(struct sock *sk) +{ + skb_queue_purge(&sk->sk_receive_queue); + skb_queue_purge(&sk->sk_write_queue); +} + static const struct proto_ops hci_sock_ops = { .family = PF_BLUETOOTH, .owner = THIS_MODULE, @@ -2111,6 +2113,7 @@ static int hci_sock_create(struct net *net, struct socket *sock, int protocol, sock->state = SS_UNCONNECTED; sk->sk_state = BT_OPEN; + sk->sk_destruct = hci_sock_destruct; bt_sock_link(&hci_sk_list, sk); return 0; -- 2.34.1
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