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SUNRPC: Don't call connect() more than once on a TCP socket
commit89f42494f9
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:3be232f11a
("SUNRPC: Prevent immediate close+reconnect") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> [meenashanmugam: Backported to 5.10: Fixed merge conflict in xs_tcp_setup_socket] Signed-off-by: Meena Shanmugam <meenashanmugam@google.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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47541ed4d4
commit
dbe6974a39
2 changed files with 13 additions and 10 deletions
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@ -89,5 +89,6 @@ struct sock_xprt {
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#define XPRT_SOCK_WAKE_WRITE (5)
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#define XPRT_SOCK_WAKE_PENDING (6)
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#define XPRT_SOCK_WAKE_DISCONNECT (7)
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#define XPRT_SOCK_CONNECT_SENT (8)
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#endif /* _LINUX_SUNRPC_XPRTSOCK_H */
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@ -2260,10 +2260,14 @@ static void xs_tcp_setup_socket(struct work_struct *work)
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struct rpc_xprt *xprt = &transport->xprt;
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int status = -EIO;
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if (!sock) {
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sock = xs_create_sock(xprt, transport,
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xs_addr(xprt)->sa_family, SOCK_STREAM,
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IPPROTO_TCP, true);
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if (xprt_connected(xprt))
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goto out;
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if (test_and_clear_bit(XPRT_SOCK_CONNECT_SENT,
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&transport->sock_state) ||
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!sock) {
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xs_reset_transport(transport);
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sock = xs_create_sock(xprt, transport, xs_addr(xprt)->sa_family,
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SOCK_STREAM, IPPROTO_TCP, true);
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if (IS_ERR(sock)) {
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status = PTR_ERR(sock);
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goto out;
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@ -2294,6 +2298,8 @@ static void xs_tcp_setup_socket(struct work_struct *work)
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break;
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case 0:
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case -EINPROGRESS:
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set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
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fallthrough;
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case -EALREADY:
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xprt_unlock_connect(xprt, transport);
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return;
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@ -2345,13 +2351,9 @@ static void xs_connect(struct rpc_xprt *xprt, struct rpc_task *task)
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WARN_ON_ONCE(!xprt_lock_connect(xprt, task, transport));
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if (transport->sock != NULL && !xprt_connecting(xprt)) {
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if (transport->sock != NULL) {
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dprintk("RPC: xs_connect delayed xprt %p for %lu "
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"seconds\n",
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xprt, xprt->reestablish_timeout / HZ);
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/* Start by resetting any existing state */
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xs_reset_transport(transport);
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"seconds\n", xprt, xprt->reestablish_timeout / HZ);
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delay = xprt_reconnect_delay(xprt);
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xprt_reconnect_backoff(xprt, XS_TCP_INIT_REEST_TO);
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