linux-kernel - [PATCH] misc: mic: Use memdup

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Message-Id: <1511364330-11055-1-git-send-email-gomonovych@gmail.com>
Date:   Wed, 22 Nov 2017 16:25:30 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     sudeep.dutt@...el.com, ashutosh.dixit@...el.com,
        dan.carpenter@...cle.com, gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, gomonovych@...il.com
Subject: [PATCH] misc: mic: Use memdup_user() as a cleanup

Fix coccicheck warning which recommends to use memdup_user():

drivers/misc/mic/vop/vop_vringh.c:940:14-21: WARNING opportunity for memdup_user
drivers/misc/mic/vop/vop_vringh.c:998:8-15: WARNING opportunity for memdup_user

Generated by: scripts/coccinelle/memdup_user/memdup_user.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 drivers/misc/mic/vop/vop_vringh.c | 21 +++++++--------------
 1 file changed, 7 insertions(+), 14 deletions(-)

diff --git a/drivers/misc/mic/vop/vop_vringh.c b/drivers/misc/mic/vop/vop_vringh.c
index fed992e2c258..bde0305ebd91 100644
--- a/drivers/misc/mic/vop/vop_vringh.c
+++ b/drivers/misc/mic/vop/vop_vringh.c
@@ -937,13 +937,10 @@ static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		    dd.num_vq > MIC_MAX_VRINGS)
 			return -EINVAL;
 
-		dd_config = kzalloc(mic_desc_size(&dd), GFP_KERNEL);
-		if (!dd_config)
-			return -ENOMEM;
-		if (copy_from_user(dd_config, argp, mic_desc_size(&dd))) {
-			ret = -EFAULT;
-			goto free_ret;
-		}
+		dd_config = memdup_user(argp, mic_desc_size(&dd));
+		if (IS_ERR(dd_config))
+			return PTR_ERR(dd_config);
+
 		/* Ensure desc has not changed between the two reads */
 		if (memcmp(&dd, dd_config, sizeof(dd))) {
 			ret = -EINVAL;
@@ -995,15 +992,11 @@ static long vop_ioctl(struct file *f, unsigned int cmd, unsigned long arg)
 		ret = vop_vdev_inited(vdev);
 		if (ret)
 			goto __unlock_ret;
-		buf = kzalloc(vdev->dd->config_len, GFP_KERNEL);
-		if (!buf) {
-			ret = -ENOMEM;
+		buf = memdup_user(argp, vdev->dd->config_len);
+		if (IS_ERR(buf)) {
+			ret = PTR_ERR(buf);
 			goto __unlock_ret;
 		}
-		if (copy_from_user(buf, argp, vdev->dd->config_len)) {
-			ret = -EFAULT;
-			goto done;
-		}
 		ret = vop_virtio_config_change(vdev, buf);
 done:
 		kfree(buf);
-- 
1.9.1