linux-kernel - [PATCH v3] nvdimm: btt_devs: fix a NULL pointer dereference

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Message-Id: <20190325213618.12139-1-pakki001@umn.edu>
Date:   Mon, 25 Mar 2019 16:36:18 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Dan Williams <dan.j.williams@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Keith Busch <keith.busch@...el.com>,
        Ira Weiny <ira.weiny@...el.com>, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v3] nvdimm: btt_devs: fix a NULL pointer dereference

In case kmemdup fails, the fix releases resources and returns to
avoid the NULL pointer dereference.

Signed-off-by: Aditya Pakki <pakki001@....edu>

---
v2: Replace incorrect kfree with ida_simple_remove, suggested by
Johannes Thumshirn
v1: Free nd_btt->id in case of failure and avoid double free, suggested
by Dan Williams
---
 drivers/nvdimm/btt_devs.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index b72a303176c7..f73fb5fdc93f 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -204,8 +204,11 @@ static struct device *__nd_btt_create(struct nd_region *nd_region,
 	}
 
 	nd_btt->lbasize = lbasize;
-	if (uuid)
+	if (uuid) {
 		uuid = kmemdup(uuid, 16, GFP_KERNEL);
+		if (!uuid)
+			goto out_put_id;
+	}
 	nd_btt->uuid = uuid;
 	dev = &nd_btt->dev;
 	dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
@@ -220,6 +223,11 @@ static struct device *__nd_btt_create(struct nd_region *nd_region,
 		return NULL;
 	}
 	return dev;
+
+out_put_id:
+	ida_simple_remove(&nd_region->btt_ida, nd_btt->id);
+	kfree(nd_btt);
+	return NULL;
 }
 
 struct device *nd_btt_create(struct nd_region *nd_region)
-- 
2.17.1