This is a note to let you know that I've just added the patch titled
net/rose: Fix to not accept on connected socket
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
net-rose-fix-to-not-accept-on-connected-socket.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6ef475aa4a27196fc5e6eae9c6e026509d2c61d1
Author: Hyunwoo Kim <v4bel@xxxxxxxxx>
Date: Wed Jan 25 02:59:44 2023 -0800
net/rose: Fix to not accept on connected socket
[ Upstream commit 14caefcf9837a2be765a566005ad82cd0d2a429f ]
If you call listen() and accept() on an already connect()ed
rose socket, accept() can successfully connect.
This is because when the peer socket sends data to sendmsg,
the skb with its own sk stored in the connected socket's
sk->sk_receive_queue is connected, and rose_accept() dequeues
the skb waiting in the sk->sk_receive_queue.
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@xxxxxxxxx>
Reviewed-by: Kuniyuki Iwashima <kuniyu@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230125105944.GA133314@ubuntu
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/net/rose/af_rose.c b/net/rose/af_rose.c
index 29a208ed8fb88..86c93cf1744b0 100644
--- a/net/rose/af_rose.c
+++ b/net/rose/af_rose.c
@@ -487,6 +487,12 @@ 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);
@@ -496,8 +502,10 @@ 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;
}
