linux-kernel - [PATCH 5.4 40/62] nbd: Aovid double completion of a request

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Message-Id: <20210816125429.568841964@linuxfoundation.org>
Date:   Mon, 16 Aug 2021 15:02:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jiang Yadong <jiangyadong@...edance.com>,
        Xie Yongji <xieyongji@...edance.com>,
        Josef Bacik <josef@...icpanda.com>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 40/62] nbd: Aovid double completion of a request

From: Xie Yongji <xieyongji@...edance.com>

[ Upstream commit cddce01160582a5f52ada3da9626c052d852ec42 ]

There is a race between iterating over requests in
nbd_clear_que() and completing requests in recv_work(),
which can lead to double completion of a request.

To fix it, flush the recv worker before iterating over
the requests and don't abort the completed request
while iterating.

Fixes: 96d97e17828f ("nbd: clear_sock on netlink disconnect")
Reported-by: Jiang Yadong <jiangyadong@...edance.com>
Signed-off-by: Xie Yongji <xieyongji@...edance.com>
Reviewed-by: Josef Bacik <josef@...icpanda.com>
Link: https://lore.kernel.org/r/20210813151330.96-1-xieyongji@bytedance.com
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/block/nbd.c | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index 839364371f9a..25e81b1a59a5 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -797,6 +797,10 @@ static bool nbd_clear_req(struct request *req, void *data, bool reserved)
 {
 	struct nbd_cmd *cmd = blk_mq_rq_to_pdu(req);
 
+	/* don't abort one completed request */
+	if (blk_mq_request_completed(req))
+		return true;
+
 	mutex_lock(&cmd->lock);
 	cmd->status = BLK_STS_IOERR;
 	mutex_unlock(&cmd->lock);
@@ -2009,15 +2013,19 @@ static void nbd_disconnect_and_put(struct nbd_device *nbd)
 {
 	mutex_lock(&nbd->config_lock);
 	nbd_disconnect(nbd);
-	nbd_clear_sock(nbd);
-	mutex_unlock(&nbd->config_lock);
+	sock_shutdown(nbd);
 	/*
 	 * Make sure recv thread has finished, so it does not drop the last
 	 * config ref and try to destroy the workqueue from inside the work
-	 * queue.
+	 * queue. And this also ensure that we can safely call nbd_clear_que()
+	 * to cancel the inflight I/Os.
 	 */
 	if (nbd->recv_workq)
 		flush_workqueue(nbd->recv_workq);
+	nbd_clear_que(nbd);
+	nbd->task_setup = NULL;
+	mutex_unlock(&nbd->config_lock);
+
 	if (test_and_clear_bit(NBD_RT_HAS_CONFIG_REF,
 			       &nbd->config->runtime_flags))
 		nbd_config_put(nbd);
-- 
2.30.2