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nvme-rdma: avoid request double completion for concurrent nvme_rdma_timeout

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[ Upstream commit 7674073b2e ]

A crash happens when inject completing request long time(nearly 30s).
Each name space has a request queue, when inject completing request long
time, multi request queues may have time out requests at the same time,
nvme_rdma_timeout will execute concurrently. Multi requests in different
request queues may be queued in the same rdma queue, multi
nvme_rdma_timeout may call nvme_rdma_stop_queue at the same time.
The first nvme_rdma_timeout will clear NVME_RDMA_Q_LIVE and continue
stopping the rdma queue(drain qp), but the others check NVME_RDMA_Q_LIVE
is already cleared, and then directly complete the requests, complete
request before the qp is fully drained may lead to a use-after-free
condition.

Add a multex lock to serialize nvme_rdma_stop_queue.

Signed-off-by: Chao Leng <lengchao@huawei.com>
Tested-by: Israel Rukshin <israelr@nvidia.com>
Reviewed-by: Israel Rukshin <israelr@nvidia.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Chao Leng 2021-01-14 17:09:25 +08:00 committed by Greg Kroah-Hartman
parent 57f26d9d09
commit 3b87f9b062
1 changed files with 11 additions and 4 deletions
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15
drivers/nvme/host/rdma.c
View file

@ -97,6 +97,7 @@ struct nvme_rdma_queue {
struct completion cm_done;
bool pi_support;
int cq_size;
struct mutex queue_lock;
};
struct nvme_rdma_ctrl {
@ -579,6 +580,7 @@ static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
int ret;
queue = &ctrl->queues[idx];
mutex_init(&queue->queue_lock);
queue->ctrl = ctrl;
if (idx && ctrl->ctrl.max_integrity_segments)
queue->pi_support = true;
@ -598,7 +600,8 @@ static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
if (IS_ERR(queue->cm_id)) {
dev_info(ctrl->ctrl.device,
"failed to create CM ID: %ld\n", PTR_ERR(queue->cm_id));
return PTR_ERR(queue->cm_id);
ret = PTR_ERR(queue->cm_id);
goto out_destroy_mutex;
}
if (ctrl->ctrl.opts->mask & NVMF_OPT_HOST_TRADDR)
@ -628,6 +631,8 @@ static int nvme_rdma_alloc_queue(struct nvme_rdma_ctrl *ctrl,
out_destroy_cm_id:
rdma_destroy_id(queue->cm_id);
nvme_rdma_destroy_queue_ib(queue);
out_destroy_mutex:
mutex_destroy(&queue->queue_lock);
return ret;
}
@ -639,9 +644,10 @@ static void __nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
static void nvme_rdma_stop_queue(struct nvme_rdma_queue *queue)
{
if (!test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
return;
__nvme_rdma_stop_queue(queue);
mutex_lock(&queue->queue_lock);
if (test_and_clear_bit(NVME_RDMA_Q_LIVE, &queue->flags))
__nvme_rdma_stop_queue(queue);
mutex_unlock(&queue->queue_lock);
}
static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
@ -651,6 +657,7 @@ static void nvme_rdma_free_queue(struct nvme_rdma_queue *queue)
nvme_rdma_destroy_queue_ib(queue);
rdma_destroy_id(queue->cm_id);
mutex_destroy(&queue->queue_lock);
}
static void nvme_rdma_free_io_queues(struct nvme_rdma_ctrl *ctrl)