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Subject[PATCH AUTOSEL 5.16 001/217] Bluetooth: hci_sock: purge socket queues in the destruct() callback
Date
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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