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authorHyunwoo Kim <v4bel@theori.io>2023-01-23 11:43:23 -0800
committerDavid S. Miller <davem@davemloft.net>2023-01-25 09:51:04 +0000
commitf2b0b5210f67c56a3bcdf92ff665fb285d6e0067 (patch)
tree6011f2b3ac88b3e1e2d0c6dc5a57b5fe88e33afa /net/x25
parent2a48216cff7a2e3964fbed16f84d33f68b3e5e42 (diff)
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/x25')
-rw-r--r--net/x25/af_x25.c6
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;