linux-kernel - [PATCH v4] powerpc/powernv: add NULL check after kzalloc in opal_add_one

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Message-Id: <20200406093944.4174-1-hqjagain@gmail.com>
Date:   Mon,  6 Apr 2020 17:39:44 +0800
From:   Qiujun Huang <hqjagain@...il.com>
To:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        oohall@...il.com
Cc:     tglx@...utronix.de, Markus.Elfring@....de, christophe.leroy@....fr,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        Qiujun Huang <hqjagain@...il.com>
Subject: [PATCH v4] powerpc/powernv: add NULL check after kzalloc in opal_add_one_export

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@...il.com>
Reviewed-by: Oliver O'Halloran <oohall@...il.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