From: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Date: Sun, 27 Aug 2017 08:30:34 +0200
Subject: libnvdimm, btt: check memory allocation failure
Patch-mainline: v4.14-rc1
Git-commit: ed36b4dba54a421ce5551638f6a9790b2c2116b1
References: FATE#323731

Check memory allocation failures and return -ENOMEM in such cases, as
already done few lines below for another memory allocation.

This avoids NULL pointers dereference.

Cc: <stable@vger.kernel.org>
Fixes: 14e494542636 ("libnvdimm, btt: BTT updates for UEFI 2.7 format")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/nvdimm/btt.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/nvdimm/btt.c
+++ b/drivers/nvdimm/btt.c
@@ -1429,6 +1429,8 @@ int nvdimm_namespace_attach_btt(struct n
 	}
 
 	btt_sb = devm_kzalloc(&nd_btt->dev, sizeof(*btt_sb), GFP_KERNEL);
+	if (!btt_sb)
+		return -ENOMEM;
 
 	/*
 	 * If this returns < 0, that is ok as it just means there wasn't