linux-kernel - [PATCH] KEYS: use memdup

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Date:   Sat, 13 May 2017 11:15:57 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     David Howells <dhowells@...hat.com>,
        James Morris <james.l.morris@...cle.com>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     Geliang Tang <geliangtang@...il.com>, keyrings@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] KEYS: use memdup_user

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 security/keys/keyctl.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
index dd0da25..ce1574a 100644
--- a/security/keys/keyctl.c
+++ b/security/keys/keyctl.c
@@ -326,14 +326,11 @@ long keyctl_update_key(key_serial_t id,
 	/* pull the payload in if one was supplied */
 	payload = NULL;
 	if (_payload) {
-		ret = -ENOMEM;
-		payload = kmalloc(plen, GFP_KERNEL);
-		if (!payload)
+		payload = memdup_user(_payload, plen);
+		if (IS_ERR(payload)) {
+			ret = PTR_ERR(payload);
 			goto error;
-
-		ret = -EFAULT;
-		if (copy_from_user(payload, _payload, plen) != 0)
-			goto error2;
+		}
 	}
 
 	/* find the target key (which must be writable) */
-- 
2.9.3