linux-kernel - [PATCH] megaraid_sas: Use memdup_user() rather than duplicating its implementation

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Date:   Sun, 21 Aug 2016 10:48:48 +0200
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     linux-scsi@...r.kernel.org, megaraidlinux.pdl@...gotech.com,
        "James E. J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        Kashyap Desai <kashyap.desai@...gotech.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sumit Saxena <sumit.saxena@...gotech.com>,
        Uday Lingala <uday.lingala@...gotech.com>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org,
        Julia Lawall <julia.lawall@...6.fr>
Subject: [PATCH] megaraid_sas: Use memdup_user() rather than duplicating its
 implementation

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Sun, 21 Aug 2016 10:39:04 +0200

Reuse existing functionality from memdup_user() instead of keeping
duplicate source code.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---
 drivers/scsi/megaraid/megaraid_sas_base.c | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index c1ed25a..9a2fe4e 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -6711,14 +6711,9 @@ static int megasas_mgmt_ioctl_fw(struct file *file, unsigned long arg)
 	unsigned long flags;
 	u32 wait_time = MEGASAS_RESET_WAIT_TIME;
 
-	ioc = kmalloc(sizeof(*ioc), GFP_KERNEL);
-	if (!ioc)
-		return -ENOMEM;
-
-	if (copy_from_user(ioc, user_ioc, sizeof(*ioc))) {
-		error = -EFAULT;
-		goto out_kfree_ioc;
-	}
+	ioc = memdup_user(user_ioc, sizeof(*ioc));
+	if (IS_ERR(ioc))
+		return PTR_ERR(ioc);
 
 	instance = megasas_lookup_instance(ioc->host_no);
 	if (!instance) {
-- 
2.9.3