[PATCH] ima: Use kmemdup rather than kmalloc+memcpy

From: Alex Dewar <alex.dewar90@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: Alex Dewar <alex.dewar90@gmail.com>,
	Mimi Zohar <zohar@linux.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@gmail.com>,
	James Morris <jmorris@namei.org>,
	"Serge E. Hallyn" <serge@hallyn.com>,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH] ima: Use kmemdup rather than kmalloc+memcpy
Date: Wed,  9 Sep 2020 20:09:06 +0100	[thread overview]
Message-ID: <20200909190907.164013-1-alex.dewar90@gmail.com> (raw)

Issue identified with Coccinelle.

Signed-off-by: Alex Dewar <alex.dewar90@gmail.com>
---
 security/integrity/ima/ima_policy.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/security/integrity/ima/ima_policy.c b/security/integrity/ima/ima_policy.c
index b4de33074b37..1de3140b334f 100644
--- a/security/integrity/ima/ima_policy.c
+++ b/security/integrity/ima/ima_policy.c
@@ -284,15 +284,14 @@ static struct ima_rule_entry *ima_lsm_copy_rule(struct ima_rule_entry *entry)
 	struct ima_rule_entry *nentry;
 	int i;
 
-	nentry = kmalloc(sizeof(*nentry), GFP_KERNEL);
-	if (!nentry)
-		return NULL;
-
 	/*
 	 * Immutable elements are copied over as pointers and data; only
 	 * lsm rules can change
 	 */
-	memcpy(nentry, entry, sizeof(*nentry));
+	nentry = kmemdup(entry, sizeof(*nentry), GFP_KERNEL);
+	if (!nentry)
+		return NULL;
+
 	memset(nentry->lsm, 0, sizeof_field(struct ima_rule_entry, lsm));
 
 	for (i = 0; i < MAX_LSM_RULES; i++) {
-- 
2.28.0

