net/x25: fix call timeouts in blocking connects

When a userspace application starts a blocking connect(), a CALL REQUEST
is sent, the t21 timer is started and the connect is waiting in
x25_wait_for_connection_establishment(). If then for some reason the t21
timer expires before any reaction on the assigned logical channel (e.g.
CALL ACCEPT, CLEAR REQUEST), there is sent a CLEAR REQUEST and timer
t23 is started waiting for a CLEAR confirmation. If we now receive a
CLEAR CONFIRMATION from the peer, x25_disconnect() is called in
x25_state2_machine() with reason "0", which means "normal" call
clearing. This is ok, but the parameter "reason" is used as sk->sk_err
in x25_disconnect() and sock_error(sk) is evaluated in
x25_wait_for_connection_establishment() to check if the call is still
pending. As "0" is not rated as an error, the connect will stuck here
forever.

To fix this situation, also check if the sk->sk_state changed form
TCP_SYN_SENT to TCP_CLOSE in the meantime, which is also done by
x25_disconnect().

Signed-off-by: Martin Schiller <ms@dev.tdt.de>
Link: https://lore.kernel.org/r/20220805061810.10824-1-ms@dev.tdt.de
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c
index 6bc2ac8d8146dcfe9dd7fdfe4f7031ca2ef54266..3b55502b296570ed0305b9d679cdf3e10b2f13f3 100644 (file)
--- a/net/x25/af_x25.c
+++ b/net/x25/af_x25.c
@@ -719,6 +719,11 @@ static int x25_wait_for_connection_establishment(struct sock *sk)
                        sk->sk_socket->state = SS_UNCONNECTED;
                        break;
                }
+               rc = -ENOTCONN;
+               if (sk->sk_state == TCP_CLOSE) {
+                       sk->sk_socket->state = SS_UNCONNECTED;
+                       break;
+               }
                rc = 0;
                if (sk->sk_state != TCP_ESTABLISHED) {
                        release_sock(sk);