linux-kernel - [PATCH v2 3/3] KEYS: use kmemdup() in request_key_auth

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Message-Id: <20170921205742.144596-4-ebiggers3@gmail.com>
Date:   Thu, 21 Sep 2017 13:57:42 -0700
From:   Eric Biggers <ebiggers3@...il.com>
To:     keyrings@...r.kernel.org
Cc:     David Howells <dhowells@...hat.com>,
        Michael Halcrow <mhalcrow@...gle.com>,
        linux-security-module@...r.kernel.org,
        linux-kernel@...r.kernel.org, Eric Biggers <ebiggers@...gle.com>
Subject: [PATCH v2 3/3] KEYS: use kmemdup() in request_key_auth_new()

From: Eric Biggers <ebiggers@...gle.com>

kmemdup() is preferred to kmalloc() followed by memcpy().

Signed-off-by: Eric Biggers <ebiggers@...gle.com>
---
 security/keys/request_key_auth.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/security/keys/request_key_auth.c b/security/keys/request_key_auth.c
index 2df92b619a38..9d536f9e5222 100644
--- a/security/keys/request_key_auth.c
+++ b/security/keys/request_key_auth.c
@@ -163,9 +163,10 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info,
 	rka = kzalloc(sizeof(*rka), GFP_KERNEL);
 	if (!rka)
 		goto error_free_rka;
-	rka->callout_info = kmalloc(callout_len, GFP_KERNEL);
+	rka->callout_info = kmemdup(callout_info, callout_len, GFP_KERNEL);
 	if (!rka->callout_info)
 		goto error_free_rka;
+	rka->callout_len = callout_len;
 
 	/* see if the calling process is already servicing the key request of
 	 * another process */
@@ -196,8 +197,6 @@ struct key *request_key_auth_new(struct key *target, const void *callout_info,
 
 	rka->target_key = key_get(target);
 	rka->dest_keyring = key_get(dest_keyring);
-	memcpy(rka->callout_info, callout_info, callout_len);
-	rka->callout_len = callout_len;
 
 	/* allocate the auth key */
 	sprintf(desc, "%x", target->serial);
-- 
2.14.1.821.g8fa685d3b7-goog