From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@lists.01.org
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH v2] device-dax: fix cdev leak
Date: Thu, 23 Feb 2017 12:34:52 -0800 [thread overview]
Message-ID: <148788199808.12623.6472923696722027067.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.
As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.
Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
v2: handle the potential of userspace establishing mappings
between cdev_add() and device_add()
drivers/dax/dax.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index ed758b74ddf0..b62a52fa3707 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -630,13 +630,10 @@ static void dax_dev_release(struct device *dev)
kfree(dax_dev);
}
-static void unregister_dax_dev(void *dev)
+static void kill_dax_dev(struct dax_dev *dax_dev)
{
- struct dax_dev *dax_dev = to_dax_dev(dev);
struct cdev *cdev = &dax_dev->cdev;
- dev_dbg(dev, "%s\n", __func__);
-
/*
* Note, rcu is not protecting the liveness of dax_dev, rcu is
* ensuring that any fault handlers that might have seen
@@ -648,6 +645,15 @@ static void unregister_dax_dev(void *dev)
synchronize_rcu();
unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
cdev_del(cdev);
+}
+
+static void unregister_dax_dev(void *dev)
+{
+ struct dax_dev *dax_dev = to_dax_dev(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ kill_dax_dev(dax_dev);
device_unregister(dev);
}
@@ -724,6 +730,7 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
rc = device_add(dev);
if (rc) {
+ kill_dax_dev(dax_dev);
put_device(dev);
return ERR_PTR(rc);
}
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WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@ml01.01.org
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH v2] device-dax: fix cdev leak
Date: Thu, 23 Feb 2017 12:34:52 -0800 [thread overview]
Message-ID: <148788199808.12623.6472923696722027067.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.
As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.
Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
v2: handle the potential of userspace establishing mappings
between cdev_add() and device_add()
drivers/dax/dax.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index ed758b74ddf0..b62a52fa3707 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -630,13 +630,10 @@ static void dax_dev_release(struct device *dev)
kfree(dax_dev);
}
-static void unregister_dax_dev(void *dev)
+static void kill_dax_dev(struct dax_dev *dax_dev)
{
- struct dax_dev *dax_dev = to_dax_dev(dev);
struct cdev *cdev = &dax_dev->cdev;
- dev_dbg(dev, "%s\n", __func__);
-
/*
* Note, rcu is not protecting the liveness of dax_dev, rcu is
* ensuring that any fault handlers that might have seen
@@ -648,6 +645,15 @@ static void unregister_dax_dev(void *dev)
synchronize_rcu();
unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
cdev_del(cdev);
+}
+
+static void unregister_dax_dev(void *dev)
+{
+ struct dax_dev *dax_dev = to_dax_dev(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ kill_dax_dev(dax_dev);
device_unregister(dev);
}
@@ -724,6 +730,7 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
rc = device_add(dev);
if (rc) {
+ kill_dax_dev(dax_dev);
put_device(dev);
return ERR_PTR(rc);
}
WARNING: multiple messages have this Message-ID (diff)
From: Dan Williams <dan.j.williams@intel.com>
To: linux-nvdimm@lists.01.org
Cc: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>,
Logan Gunthorpe <logang@deltatee.com>,
linux-kernel@vger.kernel.org, stable@vger.kernel.org
Subject: [PATCH v2] device-dax: fix cdev leak
Date: Thu, 23 Feb 2017 12:34:52 -0800 [thread overview]
Message-ID: <148788199808.12623.6472923696722027067.stgit@dwillia2-desk3.amr.corp.intel.com> (raw)
If device_add() fails, cleanup the cdev. Otherwise, we leak a kobj_map()
with a stale device number.
As Jason points out, there is a small possibility that userspace has
opened and mapped the device in the time between cdev_add() and the
device_add() failure. We need a new kill_dax_dev() helper to invalidate
any established mappings.
Fixes: ba09c01d2fa8 ("dax: convert to the cdev api")
Cc: <stable@vger.kernel.org>
Cc: Logan Gunthorpe <logang@deltatee.com>
Reported-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
v2: handle the potential of userspace establishing mappings
between cdev_add() and device_add()
drivers/dax/dax.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index ed758b74ddf0..b62a52fa3707 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -630,13 +630,10 @@ static void dax_dev_release(struct device *dev)
kfree(dax_dev);
}
-static void unregister_dax_dev(void *dev)
+static void kill_dax_dev(struct dax_dev *dax_dev)
{
- struct dax_dev *dax_dev = to_dax_dev(dev);
struct cdev *cdev = &dax_dev->cdev;
- dev_dbg(dev, "%s\n", __func__);
-
/*
* Note, rcu is not protecting the liveness of dax_dev, rcu is
* ensuring that any fault handlers that might have seen
@@ -648,6 +645,15 @@ static void unregister_dax_dev(void *dev)
synchronize_rcu();
unmap_mapping_range(dax_dev->inode->i_mapping, 0, 0, 1);
cdev_del(cdev);
+}
+
+static void unregister_dax_dev(void *dev)
+{
+ struct dax_dev *dax_dev = to_dax_dev(dev);
+
+ dev_dbg(dev, "%s\n", __func__);
+
+ kill_dax_dev(dax_dev);
device_unregister(dev);
}
@@ -724,6 +730,7 @@ struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
rc = device_add(dev);
if (rc) {
+ kill_dax_dev(dax_dev);
put_device(dev);
return ERR_PTR(rc);
}
next reply other threads:[~2017-02-23 20:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-23 20:34 Dan Williams [this message]
2017-02-23 20:34 ` [PATCH v2] device-dax: fix cdev leak Dan Williams
2017-02-23 20:34 ` Dan Williams
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