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nvme-tcp: avoid request double completion for concurrent nvme_tcp_timeout

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Each name space has a request queue, if complete request long time,
multi request queues may have time out requests at the same time,
nvme_tcp_timeout will execute concurrently. Multi requests in different
request queues may be queued in the same tcp queue, multi
nvme_tcp_timeout may call nvme_tcp_stop_queue at the same time.
The first nvme_tcp_stop_queue will clear NVME_TCP_Q_LIVE and continue
stopping the tcp queue(cancel io_work), but the others check
NVME_TCP_Q_LIVE is already cleared, and then directly complete the
requests, complete request before the io work is completely canceled may
lead to a use-after-free condition.
Add a multex lock to serialize nvme_tcp_stop_queue.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Chao Leng 2021-01-14 17:09:26 +08:00 committed by Christoph Hellwig
parent 7674073b2e
commit 9ebbfe495e
1 changed files with 10 additions and 4 deletions
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14
drivers/nvme/host/tcp.c
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@ -76,6 +76,7 @@ struct nvme_tcp_queue {
struct work_struct io_work;
int io_cpu;
struct mutex queue_lock;
struct mutex send_mutex;
struct llist_head req_list;
struct list_head send_list;
@ -1219,6 +1220,7 @@ static void nvme_tcp_free_queue(struct nvme_ctrl *nctrl, int qid)
sock_release(queue->sock);
kfree(queue->pdu);
mutex_destroy(&queue->queue_lock);
}
static int nvme_tcp_init_connection(struct nvme_tcp_queue *queue)
@ -1380,6 +1382,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
struct nvme_tcp_queue *queue = &ctrl->queues[qid];
int ret, rcv_pdu_size;
mutex_init(&queue->queue_lock);
queue->ctrl = ctrl;
init_llist_head(&queue->req_list);
INIT_LIST_HEAD(&queue->send_list);
@ -1398,7 +1401,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl,
if (ret) {
dev_err(nctrl->device,
"failed to create socket: %d\n", ret);
return ret;
goto err_destroy_mutex;
}
/* Single syn retry */
@ -1507,6 +1510,8 @@ err_crypto:
err_sock:
sock_release(queue->sock);
queue->sock = NULL;
err_destroy_mutex:
mutex_destroy(&queue->queue_lock);
return ret;
}
@ -1534,9 +1539,10 @@ static void nvme_tcp_stop_queue(struct nvme_ctrl *nctrl, int qid)
struct nvme_tcp_ctrl *ctrl = to_tcp_ctrl(nctrl);
struct nvme_tcp_queue *queue = &ctrl->queues[qid];
if (!test_and_clear_bit(NVME_TCP_Q_LIVE, &queue->flags))
return;
__nvme_tcp_stop_queue(queue);
mutex_lock(&queue->queue_lock);
if (test_and_clear_bit(NVME_TCP_Q_LIVE, &queue->flags))
__nvme_tcp_stop_queue(queue);
mutex_unlock(&queue->queue_lock);
}
static int nvme_tcp_start_queue(struct nvme_ctrl *nctrl, int idx)