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From: Israel Rukshin <israelr@mellanox.com>
To: Linux-nvme <linux-nvme@lists.infradead.org>,
	Sagi Grimberg <sagi@grimberg.me>, Christoph Hellwig <hch@lst.de>
Cc: Shlomi Nimrodi <shlomin@mellanox.com>,
	Israel Rukshin <israelr@mellanox.com>,
	Max Gurtovoy <maxg@mellanox.com>
Subject: [PATCH 3/7] nvme: Fix ctrl use-after-free during sysfs deletion
Date: Tue, 24 Mar 2020 17:29:41 +0200	[thread overview]
Message-ID: <1585063785-14268-4-git-send-email-israelr@mellanox.com> (raw)
In-Reply-To: <1585063785-14268-1-git-send-email-israelr@mellanox.com>

In case nvme_sysfs_delete() is called by the user before taking the ctrl
reference count, the ctrl may be freed during the creation and cause the
bug. Take the reference as soon as the controller is externally visible,
which is done by cdev_device_add() in nvme_init_ctrl(). Also take the
reference count at the core layer instead of taking it on each transport
separately.

Signed-off-by: Israel Rukshin <israelr@mellanox.com>
Reviewed-by: Max Gurtovoy <maxg@mellanox.com>
---
 drivers/nvme/host/core.c   | 2 ++
 drivers/nvme/host/fc.c     | 4 +---
 drivers/nvme/host/pci.c    | 1 -
 drivers/nvme/host/rdma.c   | 3 +--
 drivers/nvme/host/tcp.c    | 3 +--
 drivers/nvme/target/loop.c | 3 +--
 6 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index a461220..5ccbcac 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -4130,6 +4130,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 	if (ret)
 		goto out_release_instance;
 
+	nvme_get_ctrl(ctrl);
 	cdev_init(&ctrl->cdev, &nvme_dev_fops);
 	ctrl->cdev.owner = ops->module;
 	ret = cdev_device_add(&ctrl->cdev, ctrl->device);
@@ -4148,6 +4149,7 @@ int nvme_init_ctrl(struct nvme_ctrl *ctrl, struct device *dev,
 
 	return 0;
 out_free_name:
+	nvme_put_ctrl(ctrl);
 	kfree_const(ctrl->device->kobj.name);
 out_release_instance:
 	ida_simple_remove(&nvme_instance_ida, ctrl->instance);
diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 5a70ac3..59d2e2b 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3181,10 +3181,7 @@ enum {
 		goto fail_ctrl;
 	}
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	if (!queue_delayed_work(nvme_wq, &ctrl->connect_work, 0)) {
-		nvme_put_ctrl(&ctrl->ctrl);
 		dev_err(ctrl->ctrl.device,
 			"NVME-FC{%d}: failed to schedule initial connect\n",
 			ctrl->cnum);
@@ -3209,6 +3206,7 @@ enum {
 
 	/* initiate nvme ctrl ref counting teardown */
 	nvme_uninit_ctrl(&ctrl->ctrl);
+	nvme_put_ctrl(&ctrl->ctrl);
 
 	/* Remove core ctrl ref. */
 	nvme_put_ctrl(&ctrl->ctrl);
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index ff0bd2d..4e062c3 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2802,7 +2802,6 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	dev_info(dev->ctrl.device, "pci function %s\n", dev_name(&pdev->dev));
 
 	nvme_reset_ctrl(&dev->ctrl);
-	nvme_get_ctrl(&dev->ctrl);
 	async_schedule(nvme_async_probe, dev);
 
 	return 0;
diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 3e85c5c..ca782de 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2043,8 +2043,6 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISpcs\n",
 		ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	mutex_lock(&nvme_rdma_ctrl_mutex);
 	list_add_tail(&ctrl->list, &nvme_rdma_ctrl_list);
 	mutex_unlock(&nvme_rdma_ctrl_mutex);
@@ -2054,6 +2052,7 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
 	nvme_put_ctrl(&ctrl->ctrl);
+	nvme_put_ctrl(&ctrl->ctrl);
 	if (ret > 0)
 		ret = -EIO;
 	return ERR_PTR(ret);
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 814ea23..202f08e2 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -2429,8 +2429,6 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device, "new ctrl: NQN \"%s\", addr %pISp\n",
 		ctrl->ctrl.opts->subsysnqn, &ctrl->addr);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	mutex_lock(&nvme_tcp_ctrl_mutex);
 	list_add_tail(&ctrl->list, &nvme_tcp_ctrl_list);
 	mutex_unlock(&nvme_tcp_ctrl_mutex);
@@ -2440,6 +2438,7 @@ static struct nvme_ctrl *nvme_tcp_create_ctrl(struct device *dev,
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
 	nvme_put_ctrl(&ctrl->ctrl);
+	nvme_put_ctrl(&ctrl->ctrl);
 	if (ret > 0)
 		ret = -EIO;
 	return ERR_PTR(ret);
diff --git a/drivers/nvme/target/loop.c b/drivers/nvme/target/loop.c
index 4df4ebd..a425e28 100644
--- a/drivers/nvme/target/loop.c
+++ b/drivers/nvme/target/loop.c
@@ -618,8 +618,6 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
 	dev_info(ctrl->ctrl.device,
 		 "new ctrl: \"%s\"\n", ctrl->ctrl.opts->subsysnqn);
 
-	nvme_get_ctrl(&ctrl->ctrl);
-
 	changed = nvme_change_ctrl_state(&ctrl->ctrl, NVME_CTRL_LIVE);
 	WARN_ON_ONCE(!changed);
 
@@ -637,6 +635,7 @@ static struct nvme_ctrl *nvme_loop_create_ctrl(struct device *dev,
 	kfree(ctrl->queues);
 out_uninit_ctrl:
 	nvme_uninit_ctrl(&ctrl->ctrl);
+	nvme_put_ctrl(&ctrl->ctrl);
 out_put_ctrl:
 	nvme_put_ctrl(&ctrl->ctrl);
 	if (ret > 0)
-- 
1.8.3.1


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http://lists.infradead.org/mailman/listinfo/linux-nvme

  parent reply	other threads:[~2020-03-24 15:31 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24 15:29 [PATCH 0/7 V3] nvme: Fixes for deleting a ctrl before it was created Israel Rukshin
2020-03-24 15:29 ` [PATCH 1/7] nvme: Remove unused return code from nvme_delete_ctrl_sync Israel Rukshin
2020-03-24 15:29 ` [PATCH 2/7] nvme-pci: Re-order nvme_pci_free_ctrl Israel Rukshin
2020-03-24 15:42   ` Christoph Hellwig
2020-03-24 15:29 ` Israel Rukshin [this message]
2020-03-24 15:42   ` [PATCH 3/7] nvme: Fix ctrl use-after-free during sysfs deletion Christoph Hellwig
2020-03-24 15:29 ` [PATCH 4/7] nvme: Make nvme_uninit_ctrl symmetric to nvme_init_ctrl Israel Rukshin
2020-03-24 15:42   ` Christoph Hellwig
2020-03-24 15:29 ` [PATCH 5/7] nvme: Fix controller creation races with teardown flow Israel Rukshin
2020-08-19 23:16   ` James Smart
2020-08-21  0:28     ` Sagi Grimberg
2020-03-24 15:29 ` [PATCH 6/7] nvme-rdma: Add warning on state change failure at nvme_rdma_setup_ctrl Israel Rukshin
2020-03-25  0:19   ` Sagi Grimberg
2020-03-25 10:07     ` Israel Rukshin
2020-03-24 15:29 ` [PATCH 7/7] nvme-tcp: Add warning on state change failure at nvme_tcp_setup_ctrl Israel Rukshin
2020-03-24 16:17 ` [PATCH 0/7 V3] nvme: Fixes for deleting a ctrl before it was created Keith Busch

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