linux-kernel - [PATCH 4.17 115/336] nvme-rdma: stop admin queue before freeing it

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Message-Id: <20180801165033.551254396@linuxfoundation.org>
Date:   Wed,  1 Aug 2018 18:47:30 +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, Jianchao Wang <jianchao.w.wang@...cle.com>,
        Sagi Grimberg <sagi@...mberg.me>,
        Max Gurtovoy <maxg@...lanox.com>,
        Christoph Hellwig <hch@....de>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 115/336] nvme-rdma: stop admin queue before freeing it

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

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

From: Jianchao Wang <jianchao.w.wang@...cle.com>

[ Upstream commit 2e050f00a0f0e07467050cb4afae0234941e5bf3 ]

For any failure after nvme_rdma_start_queue in
nvme_rdma_configure_admin_queue, the admin queue will be freed with the
NVME_RDMA_Q_LIVE flag still set.  Once nvme_rdma_stop_queue is invoked,
that will cause a use-after-free.
BUG: KASAN: use-after-free in rdma_disconnect+0x1f/0xe0 [rdma_cm]

To fix it, call nvme_rdma_stop_queue for all the failed cases after
nvme_rdma_start_queue.

Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>
Suggested-by: Sagi Grimberg <sagi@...mberg.me>
Reviewed-by: Max Gurtovoy <maxg@...lanox.com>
Signed-off-by: Christoph Hellwig <hch@....de>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/nvme/host/rdma.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -778,7 +778,7 @@ static int nvme_rdma_configure_admin_que
 	if (error) {
 		dev_err(ctrl->ctrl.device,
 			"prop_get NVME_REG_CAP failed\n");
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 	}
 
 	ctrl->ctrl.sqsize =
@@ -786,23 +786,25 @@ static int nvme_rdma_configure_admin_que
 
 	error = nvme_enable_ctrl(&ctrl->ctrl, ctrl->ctrl.cap);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	ctrl->ctrl.max_hw_sectors =
 		(ctrl->max_fr_pages - 1) << (ilog2(SZ_4K) - 9);
 
 	error = nvme_init_identify(&ctrl->ctrl);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	error = nvme_rdma_alloc_qe(ctrl->queues[0].device->dev,
 			&ctrl->async_event_sqe, sizeof(struct nvme_command),
 			DMA_TO_DEVICE);
 	if (error)
-		goto out_cleanup_queue;
+		goto out_stop_queue;
 
 	return 0;
 
+out_stop_queue:
+	nvme_rdma_stop_queue(&ctrl->queues[0]);
 out_cleanup_queue:
 	if (new)
 		blk_cleanup_queue(ctrl->ctrl.admin_q);