[PATCH v4] powerpc/powernv: add NULL check after kzalloc in opal_add_one_export

[Qiujun Huang]

Here needs a NULL check as kzalloc may fail returning NULL.

Issue was found by coccinelle.
Generated by: scripts/coccinelle/null/kmerr.cocci

Signed-off-by: Qiujun Huang <hqjagain at gmail.com>
Reviewed-by: Oliver O'Halloran <oohall at gmail.com>

---

v3->v4:
	Added the information about coccinelle script.
	Added change log.
	Added Oliver's Reviewed-by.
v2->v3:
	Removed redundant assignment to 'attr' and 'name'.
v1->v2:
	Just return -ENOMEM if attr is NULL.
---
 arch/powerpc/platforms/powernv/opal.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/arch/powerpc/platforms/powernv/opal.c b/arch/powerpc/platforms/powernv/opal.c
index 2b3dfd0b6cdd..908d749bcef5 100644
--- a/arch/powerpc/platforms/powernv/opal.c
+++ b/arch/powerpc/platforms/powernv/opal.c
@@ -801,16 +801,19 @@ static ssize_t export_attr_read(struct file *fp, struct kobject *kobj,
 static int opal_add_one_export(struct kobject *parent, const char *export_name,
 			       struct device_node *np, const char *prop_name)
 {
-	struct bin_attribute *attr = NULL;
-	const char *name = NULL;
+	struct bin_attribute *attr;
+	const char *name;
 	u64 vals[2];
 	int rc;
 
 	rc = of_property_read_u64_array(np, prop_name, &vals[0], 2);
 	if (rc)
-		goto out;
+		return rc;
 
 	attr = kzalloc(sizeof(*attr), GFP_KERNEL);
+	if (!attr)
+		return -ENOMEM;
+
 	name = kstrdup(export_name, GFP_KERNEL);
 	if (!name) {
 		rc = -ENOMEM;
-- 
2.17.1