linux-kernel - [PATCH v2] nvdimm: btt_devs: fix a NULL pointer dereference

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Date:   Sat, 23 Mar 2019 16:41:25 -0500
From:   Aditya Pakki <pakki001@....edu>
To:     pakki001@....edu
Cc:     kjlu@....edu, Vishal Verma <vishal.l.verma@...el.com>,
        Dan Williams <dan.j.williams@...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 v2] 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>

---
v1: Free nd_btt->id in case of failure and avoid double free, suggested
by Dan Williams
---
 drivers/nvdimm/btt_devs.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index b72a303176c7..119a4ead2e46 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -204,8 +204,14 @@ 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) {
+			kfree(nd_btt->id);
+			kfree(nd_btt);
+			return NULL;
+		}
+	}
 	nd_btt->uuid = uuid;
 	dev = &nd_btt->dev;
 	dev_set_name(dev, "btt%d.%d", nd_region->id, nd_btt->id);
-- 
2.17.1