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| author | Hyunwoo Kim <v4bel@theori.io> | 2023-01-23 11:43:23 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-01-25 09:51:04 +0000 |
| commit | f2b0b5210f67c56a3bcdf92ff665fb285d6e0067 (patch) | |
| tree | 6011f2b3ac88b3e1e2d0c6dc5a57b5fe88e33afa /net | |
| parent | 2a48216cff7a2e3964fbed16f84d33f68b3e5e42 (diff) | |
| download | linux-stable-f2b0b5210f67c56a3bcdf92ff665fb285d6e0067.tar.gz linux-stable-f2b0b5210f67c56a3bcdf92ff665fb285d6e0067.tar.bz2 linux-stable-f2b0b5210f67c56a3bcdf92ff665fb285d6e0067.zip | |
net/x25: Fix to not accept on connected socket
When listen() and accept() are called on an x25 socket
that connect() succeeds, accept() succeeds immediately.
This is because x25_connect() queues the skb to
sk->sk_receive_queue, and x25_accept() dequeues it.
This creates a child socket with the sk of the parent
x25 socket, which can cause confusion.
Fix x25_listen() to return -EINVAL if the socket has
already been successfully connect()ed to avoid this issue.
Signed-off-by: Hyunwoo Kim <v4bel@theori.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/x25/af_x25.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 3b55502b2965..5c7ad301d742 100644 --- a/net/x25/af_x25.c +++ b/net/x25/af_x25.c @@ -482,6 +482,12 @@ static int x25_listen(struct socket *sock, int backlog) int rc = -EOPNOTSUPP; lock_sock(sk); + if (sock->state != SS_UNCONNECTED) { + rc = -EINVAL; + release_sock(sk); + return rc; + } + if (sk->sk_state != TCP_LISTEN) { memset(&x25_sk(sk)->dest_addr, 0, X25_ADDR_LEN); sk->sk_max_ack_backlog = backlog; |