From: Kangjie Lu <kjlu@umn.edu>
Date: Tue, 12 Mar 2019 08:20:34 +0000 (-0500)
Subject: libnvdimm/namespace: Fix a potential NULL pointer dereference
X-Git-Tag: v4.9.177~45
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=93cc83319f9aca32b0d4cd5156086d908287b376;p=platform%2Fkernel%2Flinux-amlogic.git

libnvdimm/namespace: Fix a potential NULL pointer dereference

[ Upstream commit 55c1fc0af29a6c1b92f217b7eb7581a882e0c07c ]

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

Signed-off-by: Kangjie Lu <kjlu@umn.edu>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---

diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c
index 9bc5f555ee68..cf4a90b50f8b 100644
--- a/drivers/nvdimm/namespace_devs.c
+++ b/drivers/nvdimm/namespace_devs.c
@@ -2028,9 +2028,12 @@ 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)