linux-kernel - [PATCH 5/5] Drivers: hv: utils: use memdup_user in hvt_op

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Message-Id: <1444058839-19008-6-git-send-email-olaf@aepfle.de>
Date:	Mon,  5 Oct 2015 15:27:19 +0000
From:	Olaf Hering <olaf@...fle.de>
To:	kys@...rosoft.com, haiyangz@...rosoft.com,
	gregkh@...uxfoundation.org
Cc:	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	Olaf Hering <olaf@...fle.de>
Subject: [PATCH 5/5] Drivers: hv: utils: use memdup_user in hvt_op_write

Use memdup_user to handle OOM.

Fixes: 14b50f80c32d ('Drivers: hv: util: introduce hv_utils_transport abstraction')

Signed-off-by: Olaf Hering <olaf@...fle.de>
---
 drivers/hv/hv_utils_transport.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/hv/hv_utils_transport.c b/drivers/hv/hv_utils_transport.c
index 1505ee6..24b2766 100644
--- a/drivers/hv/hv_utils_transport.c
+++ b/drivers/hv/hv_utils_transport.c
@@ -80,11 +80,10 @@ static ssize_t hvt_op_write(struct file *file, const char __user *buf,
 
 	hvt = container_of(file->f_op, struct hvutil_transport, fops);
 
-	inmsg = kzalloc(count, GFP_KERNEL);
-	if (copy_from_user(inmsg, buf, count)) {
-		kfree(inmsg);
-		return -EFAULT;
-	}
+	inmsg = memdup_user(buf, count);
+	if (IS_ERR(inmsg))
+		return PTR_ERR(inmsg);
+
 	if (hvt->on_msg(inmsg, count))
 		return -EFAULT;
 	kfree(inmsg);
--
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