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authorTrond Myklebust2022-03-16 19:10:43 -0400
committerTrond Myklebust2022-03-22 15:52:55 -0400
commit89f42494f92f448747bd8a7ab1ae8b5d5520577d (patch)
treef71b09bc13d49289b34edaec3e3cb8bca5193707 /net
parente47a62df29a0714cc2d5129516a3618337c84554 (diff)
SUNRPC: Don't call connect() more than once on a TCP socket
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>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/xprtsock.c22
1 files changed, 12 insertions, 10 deletions
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 7e39f87cde2d..8f8a03c3315a 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -2235,10 +2235,15 @@ static void xs_tcp_setup_socket(struct work_struct *work)
if (atomic_read(&xprt->swapper))
current->flags |= PF_MEMALLOC;
- 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)) {
xprt_wake_pending_tasks(xprt, PTR_ERR(sock));
goto out;
@@ -2262,6 +2267,7 @@ static void xs_tcp_setup_socket(struct work_struct *work)
fallthrough;
case -EINPROGRESS:
/* SYN_SENT! */
+ set_bit(XPRT_SOCK_CONNECT_SENT, &transport->sock_state);
if (xprt->reestablish_timeout < XS_TCP_INIT_REEST_TO)
xprt->reestablish_timeout = XS_TCP_INIT_REEST_TO;
fallthrough;
@@ -2323,13 +2329,9 @@ 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);