linux-kernel - [PATCH] nvdimm: namespace_devs: fix a potential NULL pointer dereference

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Date:   Tue, 12 Mar 2019 03:20:34 -0500
From:   Kangjie Lu <kjlu@....edu>
To:     kjlu@....edu
Cc:     pakki001@....edu, Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Vishal Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>, linux-nvdimm@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] nvdimm: namespace_devs: fix a potential NULL pointer dereference

In case kmemdup fails, the fix goes to blk_err to avoid NULL
pointer dereference

Signed-off-by: Kangjie Lu <kjlu@....edu>
---
 drivers/nvdimm/namespace_devs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 4b077555ac70..6f65261e151f 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -2245,9 +2245,12 @@ static struct device *create_namespace_blk(struct nd_region *nd_region,
 	if (!nsblk->uuid)
 		goto blk_err;
 	memcpy(name, nd_label->name, NSLABEL_NAME_LEN);
-	if (name[0])
+	if (name[0]) {
 		nsblk->alt_name = kmemdup(name, NSLABEL_NAME_LEN,
 				GFP_KERNEL);
+		if (!nsblk->alt_name)
+			goto blk_err;
+	}
 	res = nsblk_add_resource(nd_region, ndd, nsblk,
 			__le64_to_cpu(nd_label->dpa));
 	if (!res)
-- 
2.17.1