[PATCH AUTOSEL 4.4 04/14] libnvdimm/btt: Fix a kmemdup failure check

[Sasha Levin]

From: Aditya Pakki <pakki...@umn.edu>

[ Upstream commit 486fa92df4707b5df58d6508728bdb9321a59766 ]

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

Signed-off-by: Aditya Pakki <pakki...@umn.edu>
Signed-off-by: Dan Williams <dan.j.willi...@intel.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nvdimm/btt_devs.c | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index cb477518dd0e..4c129450495d 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -170,14 +170,15 @@ static struct device *__nd_btt_create(struct nd_region 
*nd_region,
                return NULL;
 
        nd_btt->id = ida_simple_get(&nd_region->btt_ida, 0, 0, GFP_KERNEL);
-       if (nd_btt->id < 0) {
-               kfree(nd_btt);
-               return NULL;
-       }
+       if (nd_btt->id < 0)
+               goto out_nd_btt;
 
        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);
@@ -192,6 +193,13 @@ 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);
+
+out_nd_btt:
+       kfree(nd_btt);
+       return NULL;
 }
 
 struct device *nd_btt_create(struct nd_region *nd_region)
-- 
2.20.1