linux-kernel - [PATCH 3/6] sysfs: use memdup

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Date:	Wed, 08 Apr 2009 15:07:30 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Greg KH <greg@...ah.com>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCH 3/6] sysfs: use memdup_user()

Remove open-coded memdup_user().

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 fs/sysfs/bin.c |   13 +++----------
 1 files changed, 3 insertions(+), 10 deletions(-)

diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 93e0c02..9345806 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -157,14 +157,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
 			count = size - offs;
 	}
 
-	temp = kmalloc(count, GFP_KERNEL);
-	if (!temp)
-		return -ENOMEM;
-
-	if (copy_from_user(temp, userbuf, count)) {
-		count = -EFAULT;
-		goto out_free;
-	}
+	temp = memdup_user(userbuf, count);
+	if (IS_ERR(temp))
+		return PTR_ERR(temp);
 
 	mutex_lock(&bb->mutex);
 
@@ -176,8 +171,6 @@ static ssize_t write(struct file *file, const char __user *userbuf,
 	if (count > 0)
 		*off = offs + count;
 
-out_free:
-	kfree(temp);
 	return count;
 }
 
-- 
1.5.4.rc3

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