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| author | Martin Schiller <ms@dev.tdt.de> | 2022-08-05 08:18:10 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-08-08 20:48:51 -0700 |
| commit | 944e594cfa84ec552831489c244e02589d826b11 (patch) | |
| tree | b4219f76da4247b7270cf520bacfe420795dd365 | |
| parent | 8eb6fcc9a7cb4337ba985a397d892af5c0ddb0e7 (diff) | |
| download | linux-944e594cfa84ec552831489c244e02589d826b11.tar.gz linux-944e594cfa84ec552831489c244e02589d826b11.tar.bz2 linux-944e594cfa84ec552831489c244e02589d826b11.zip | |
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>
| -rw-r--r-- | net/x25/af_x25.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/x25/af_x25.c b/net/x25/af_x25.c index 6bc2ac8d8146..3b55502b2965 100644 --- 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); |