From: Aditya Pakki <pakki001@umn.edu>
To: pakki001@umn.edu
Cc: kjlu@umn.edu, Vishal Verma <vishal.l.verma@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
Keith Busch <keith.busch@intel.com>,
Ira Weiny <ira.weiny@intel.com>,
linux-nvdimm@lists.01.org, linux-kernel@vger.kernel.org
Subject: [PATCH v4] nvdimm: btt_devs: fix a NULL pointer dereference
Date: Mon, 25 Mar 2019 16:55:27 -0500 [thread overview]
Message-ID: <20190325215527.12574-1-pakki001@umn.edu> (raw)
In case kmemdup fails, the fix releases resources and returns to
avoid the NULL pointer dereference.
Signed-off-by: Aditya Pakki <pakki001@umn.edu>
---
v3: Move kfree(nd_btt) to goto block.
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 | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/nvdimm/btt_devs.c b/drivers/nvdimm/btt_devs.c
index b72a303176c7..9486acc08402 100644
--- a/drivers/nvdimm/btt_devs.c
+++ b/drivers/nvdimm/btt_devs.c
@@ -198,14 +198,15 @@ 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);
@@ -220,6 +221,13 @@ 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)
--
2.17.1
next reply other threads:[~2019-03-25 21:55 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-25 21:55 Aditya Pakki [this message]
2019-03-26 10:23 ` [PATCH v4] nvdimm: btt_devs: fix a NULL pointer dereference Mukesh Ojha
2019-03-26 18:31 ` Dan Williams
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