linux-kernel - [PATCH] skd_main: use memdup

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Message-Id: <dffefe927f4d442ac8e205b6ce50ee12eae4e991.1493381776.git.geliangtang@gmail.com>
Date:   Sat, 29 Apr 2017 09:45:17 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Jens Axboe <axboe@...com>, Arnd Bergmann <arnd@...db.de>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH] skd_main: use memdup_user

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

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 drivers/block/skd_main.c | 16 +++++-----------
 1 file changed, 5 insertions(+), 11 deletions(-)

diff --git a/drivers/block/skd_main.c b/drivers/block/skd_main.c
index 27833e4..6b3cdd2 100644
--- a/drivers/block/skd_main.c
+++ b/drivers/block/skd_main.c
@@ -1394,22 +1394,16 @@ static int skd_sg_io_get_and_check_args(struct skd_device *skdev,
 		uint nbytes = sizeof(*iov) * sgp->iovec_count;
 		size_t iov_data_len;
 
-		iov = kmalloc(nbytes, GFP_KERNEL);
-		if (iov == NULL) {
-			pr_debug("%s:%s:%d alloc iovec failed %d\n",
+		iov = memdup_user(sgp->dxferp, nbytes);
+		if (IS_ERR(iov)) {
+			pr_debug("%s:%s:%d memdup_user iovec failed %d %p\n",
 				 skdev->name, __func__, __LINE__,
-				 sgp->iovec_count);
-			return -ENOMEM;
+				 sgp->iovec_count, sgp->dxferp);
+			return PTR_ERR(iov);
 		}
 		sksgio->iov = iov;
 		sksgio->iovcnt = sgp->iovec_count;
 
-		if (copy_from_user(iov, sgp->dxferp, nbytes)) {
-			pr_debug("%s:%s:%d copy_from_user iovec failed %p\n",
-				 skdev->name, __func__, __LINE__, sgp->dxferp);
-			return -EFAULT;
-		}
-
 		/*
 		 * Sum up the vecs, making sure they don't overflow
 		 */
-- 
2.9.3