From: Sachin Shukla <sachin.s5@samsung.com>
To: Jens Axboe <axboe@fb.com>, Asai Thambi SP <asamymuthupa@micron.com>,
        Selvan Mani <smani@micron.com>,
        Rajesh Kumar Sambandam <rsambandam@micron.com>,
        Vignesh Gunasekaran <vgunasekaran@micron.com>,
        Al Viro <viro@zeniv.linux.org.uk>, linux-kernel@vger.kernel.org,
        sachiniiitm@gmail.com
Cc: ravikant.s2@samsung.com, p.shailesh@samsung.com,
        ashish.kalra@samsung.com, vidushi.koul@samsung.com
Subject: [PATCH] Block: mtip32xx: Improvement in code readability when
 memdup_user() fails.
Date: Fri, 11 Nov 2016 14:34:51 +0530
Message-id: <1478855091-26096-1-git-send-email-sachin.s5@samsung.com>
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 1161
Lines: 40

From: "Sachin Shukla" <sachin.s5@samsung.com>

There is no need to call kfree() if memdup_user() fails, as no memory
was allocated and the error in the error-valued pointer should be returned.

Signed-off-by: Sachin Shukla <sachin.s5@samsung.com>
---
 drivers/block/mtip32xx/mtip32xx.c |   14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 3cfd879..68e332b 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -2035,18 +2035,14 @@ static int exec_drive_taskfile(struct driver_data *dd,
 	taskout = req_task->out_size;
 	taskin = req_task->in_size;
 	/* 130560 = 512 * 0xFF*/
-	if (taskin > 130560 || taskout > 130560) {
-		err = -EINVAL;
-		goto abort;
-	}
+	if (taskin > 130560 || taskout > 130560)
+		return -EINVAL;
 
 	if (taskout) {
 		outbuf = memdup_user(buf + outtotal, taskout);
-		if (IS_ERR(outbuf)) {
-			err = PTR_ERR(outbuf);
-			outbuf = NULL;
-			goto abort;
-		}
+		if (IS_ERR(outbuf))
+			return PTR_ERR(outbuf);
+
 		outbuf_dma = pci_map_single(dd->pdev,
 					 outbuf,
 					 taskout,
-- 
1.7.9.5