From: Hyunwoo Kim <v4bel@theori.io>
To: ralf@linux-mips.org, davem@davemloft.net, edumazet@google.com,
kuba@kernel.org, pabeni@redhat.com
Cc: v4bel@theori.io, imv4bel@gmail.com, linux-hams@vger.kernel.org,
netdev@vger.kernel.org
Subject: [PATCH v2] net/rose: Fix to not accept on connected socket
Date: Mon, 23 Jan 2023 11:40:20 -0800 [thread overview]
Message-ID: <20230123194020.GA115501@ubuntu> (raw)
If listen() and accept() are called on a rose socket
that connect() is successful, accept() succeeds immediately.
This is because rose_connect() queues the skb to
sk->sk_receive_queue, and rose_accept() dequeues it.
This creates a child socket with the sk of the parent
rose socket, which can cause confusion.
Fix rose_listen() to return -EINVAL if the socket has
already been successfully connected, and add lock_sock
to prevent this issue.
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
---
net/rose/af_rose.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 36fefc3957d7..ca2b17f32670 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -488,6 +488,12 @@ static int rose_listen(struct socket *sock, int backlog)
{
struct sock *sk = sock->sk;
+ lock_sock(sk);
+ if (sock->state != SS_UNCONNECTED) {
+ release_sock(sk);
+ return -EINVAL;
+ }
+
if (sk->sk_state != TCP_LISTEN) {
struct rose_sock *rose = rose_sk(sk);
@@ -497,8 +503,10 @@ static int rose_listen(struct socket *sock, int backlog)
memset(rose->dest_digis, 0, AX25_ADDR_LEN * ROSE_MAX_DIGIS);
sk->sk_max_ack_backlog = backlog;
sk->sk_state = TCP_LISTEN;
+ release_sock(sk);
return 0;
}
+ release_sock(sk);
return -EOPNOTSUPP;
}
--
2.25.1
next reply other threads:[~2023-01-23 19:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-23 19:40 Hyunwoo Kim [this message]
2023-01-25 2:08 ` [PATCH v2] net/rose: Fix to not accept on connected socket Kuniyuki Iwashima
2023-01-25 2:28 ` Kuniyuki Iwashima
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