[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 <hqjag...@gmail.com>
Reviewed-by: Oliver O'Halloran <ooh...@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