diff options
| author | Meena Shanmugam <meenashanmugam@google.com> | 2022-05-18 18:40:10 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-25 09:14:34 +0200 |
| commit | 975a0f14d5cd29fe4b33190b5afcfa9f244b769d (patch) | |
| tree | be03a6d6c3768766a882e2c67f69e7a4e84831a2 /net | |
| parent | aa4d71edd60941bc05d2a0efe1e98a67c5dd59b7 (diff) | |
SUNRPC: Don't call connect() more than once on a TCP socket
From: Trond Myklebust <trond.myklebust@hammerspace.com>
commit 89f42494f92f448747bd8a7ab1ae8b5d5520577d upstream.
Avoid socket state races due to repeated calls to ->connect() using the
same socket. If connect() returns 0 due to the connection having
completed, but we are in fact in a closing state, then we may leave the
XPRT_CONNECTING flag set on the transport.
Reported-by: Enrico Scholz <enrico.scholz@sigma-chemnitz.de>
Fixes: 3be232f11a3c ("SUNRPC: Prevent immediate close+reconnect")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
[meenashanmugam: Fix merge conflict in xs_tcp_setup_socket]
Signed-off-by: Meena Shanmugam <meenashanmugam@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/xprtsock.c | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 49ba817f4fb6..29e9c54a89d3 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -2384,10 +2384,14 @@ static void xs_tcp_setup_socket(struct work_struct *work) struct rpc_xprt *xprt = &transport->xprt; int status = -EIO; - if (!sock) { - sock = xs_create_sock(xprt, transport, - xs_addr(xprt)->sa_family, SOCK_STREAM, - IPPROTO_TCP, true); + if (xprt_connected(xprt)) + goto out; + if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT, + &transport->sock_state) || + !sock) { + xs_reset_transport(transport); + sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family, + SOCK_STREAM, IPPROTO_TCP, true); if (IS_ERR(sock)) { status = PTR_ERR(sock); goto out; @@ -2418,6 +2422,8 @@ static void xs_tcp_setup_socket(struct work_struct *work) break; case 0: case -EINPROGRESS: + set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state); + fallthrough; case -EALREADY: xprt_unlock_connect(xprt, transport); return; @@ -2469,13 +2475,9 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task) WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport)); - if (transport->sock != NULL && !xprt_connecting(xprt)) { + if (transport->sock != NULL) { dprintk("RPC: xs_connect delayed xprt %p for %lu " - "seconds\n", - xprt, xprt->reestablish_timeout / HZ); - - /* Start by resetting any existing state */ - xs_reset_transport(transport); + "seconds\n", xprt, xprt->reestablish_timeout / HZ); delay = xprt_reconnect_delay(xprt); xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO); |