Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, David Howells <dhowells@redhat.com>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.18 086/150] rxrpc: Fix connection-level abort handling
Date:   Fri,  2 Nov 2018 19:34:08 +0100
Message-Id: <20181102182909.513550182@linuxfoundation.org>
In-Reply-To: <20181102182902.250560510@linuxfoundation.org>
References: <20181102182902.250560510@linuxfoundation.org>
User-Agent: quilt/0.65
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

[ Upstream commit 647530924f47c93db472ee3cf43b7ef1425581b6 ]

Fix connection-level abort handling to cache the abort and error codes
properly so that a new incoming call can be properly aborted if it races
with the parent connection being aborted by another CPU.

The abort_code and error parameters can then be dropped from
rxrpc_abort_calls().

Fixes: f5c17aaeb2ae ("rxrpc: Calls should only have one terminal state")
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/rxrpc/ar-internal.h |    4 ++--
 net/rxrpc/call_accept.c |    4 ++--
 net/rxrpc/conn_event.c  |   26 +++++++++++++++-----------
 3 files changed, 19 insertions(+), 15 deletions(-)

--- a/net/rxrpc/ar-internal.h
+++ b/net/rxrpc/ar-internal.h
@@ -446,8 +446,7 @@ struct rxrpc_connection {
 	spinlock_t		state_lock;	/* state-change lock */
 	enum rxrpc_conn_cache_state cache_state;
 	enum rxrpc_conn_proto_state state;	/* current state of connection */
-	u32			local_abort;	/* local abort code */
-	u32			remote_abort;	/* remote abort code */
+	u32			abort_code;	/* Abort code of connection abort */
 	int			debug_id;	/* debug ID for printks */
 	atomic_t		serial;		/* packet serial number counter */
 	unsigned int		hi_serial;	/* highest serial number received */
@@ -457,6 +456,7 @@ struct rxrpc_connection {
 	u8			security_size;	/* security header size */
 	u8			security_ix;	/* security type */
 	u8			out_clientflag;	/* RXRPC_CLIENT_INITIATED if we are client */
+	short			error;		/* Local error code */
 };
 
 static inline bool rxrpc_to_server(const struct rxrpc_skb_priv *sp)
--- a/net/rxrpc/call_accept.c
+++ b/net/rxrpc/call_accept.c
@@ -422,11 +422,11 @@ found_service:
 
 	case RXRPC_CONN_REMOTELY_ABORTED:
 		rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
-					  conn->remote_abort, -ECONNABORTED);
+					  conn->abort_code, conn->error);
 		break;
 	case RXRPC_CONN_LOCALLY_ABORTED:
 		rxrpc_abort_call("CON", call, sp->hdr.seq,
-				 conn->local_abort, -ECONNABORTED);
+				 conn->abort_code, conn->error);
 		break;
 	default:
 		BUG();
--- a/net/rxrpc/conn_event.c
+++ b/net/rxrpc/conn_event.c
@@ -126,7 +126,7 @@ static void rxrpc_conn_retransmit_call(s
 
 	switch (chan->last_type) {
 	case RXRPC_PACKET_TYPE_ABORT:
-		_proto("Tx ABORT %%%u { %d } [re]", serial, conn->local_abort);
+		_proto("Tx ABORT %%%u { %d } [re]", serial, conn->abort_code);
 		break;
 	case RXRPC_PACKET_TYPE_ACK:
 		trace_rxrpc_tx_ack(NULL, serial, chan->last_seq, 0,
@@ -148,13 +148,12 @@ static void rxrpc_conn_retransmit_call(s
  * pass a connection-level abort onto all calls on that connection
  */
 static void rxrpc_abort_calls(struct rxrpc_connection *conn,
-			      enum rxrpc_call_completion compl,
-			      u32 abort_code, int error)
+			      enum rxrpc_call_completion compl)
 {
 	struct rxrpc_call *call;
 	int i;
 
-	_enter("{%d},%x", conn->debug_id, abort_code);
+	_enter("{%d},%x", conn->debug_id, conn->abort_code);
 
 	spin_lock(&conn->channel_lock);
 
@@ -167,9 +166,11 @@ static void rxrpc_abort_calls(struct rxr
 				trace_rxrpc_abort(call->debug_id,
 						  "CON", call->cid,
 						  call->call_id, 0,
-						  abort_code, error);
+						  conn->abort_code,
+						  conn->error);
 			if (rxrpc_set_call_completion(call, compl,
-						      abort_code, error))
+						      conn->abort_code,
+						      conn->error))
 				rxrpc_notify_socket(call);
 		}
 	}
@@ -202,10 +203,12 @@ static int rxrpc_abort_connection(struct
 		return 0;
 	}
 
+	conn->error = error;
+	conn->abort_code = abort_code;
 	conn->state = RXRPC_CONN_LOCALLY_ABORTED;
 	spin_unlock_bh(&conn->state_lock);
 
-	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED, abort_code, error);
+	rxrpc_abort_calls(conn, RXRPC_CALL_LOCALLY_ABORTED);
 
 	msg.msg_name	= &conn->params.peer->srx.transport;
 	msg.msg_namelen	= conn->params.peer->srx.transport_len;
@@ -224,7 +227,7 @@ static int rxrpc_abort_connection(struct
 	whdr._rsvd	= 0;
 	whdr.serviceId	= htons(conn->service_id);
 
-	word		= htonl(conn->local_abort);
+	word		= htonl(conn->abort_code);
 
 	iov[0].iov_base	= &whdr;
 	iov[0].iov_len	= sizeof(whdr);
@@ -235,7 +238,7 @@ static int rxrpc_abort_connection(struct
 
 	serial = atomic_inc_return(&conn->serial);
 	whdr.serial = htonl(serial);
-	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->local_abort);
+	_proto("Tx CONN ABORT %%%u { %d }", serial, conn->abort_code);
 
 	ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len);
 	if (ret < 0) {
@@ -308,9 +311,10 @@ static int rxrpc_process_event(struct rx
 		abort_code = ntohl(wtmp);
 		_proto("Rx ABORT %%%u { ac=%d }", sp->hdr.serial, abort_code);
 
+		conn->error = -ECONNABORTED;
+		conn->abort_code = abort_code;
 		conn->state = RXRPC_CONN_REMOTELY_ABORTED;
-		rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED,
-				  abort_code, -ECONNABORTED);
+		rxrpc_abort_calls(conn, RXRPC_CALL_REMOTELY_ABORTED);
 		return -ECONNABORTED;
 
 	case RXRPC_PACKET_TYPE_CHALLENGE: