linux-kernel - [PATCH 1/6] xattr: use memdup

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Date:	Wed, 08 Apr 2009 15:06:12 +0800
From:	Li Zefan <lizf@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Al Viro <viro@...IV.linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/6] xattr: use memdup_user()

Remove open-coded memdup_user()

Signed-off-by: Li Zefan <lizf@...fujitsu.com>
---
 fs/xattr.c |   10 +++-------
 1 files changed, 3 insertions(+), 7 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c
index 197c4fc..d51b8f9 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -237,13 +237,9 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
 	if (size) {
 		if (size > XATTR_SIZE_MAX)
 			return -E2BIG;
-		kvalue = kmalloc(size, GFP_KERNEL);
-		if (!kvalue)
-			return -ENOMEM;
-		if (copy_from_user(kvalue, value, size)) {
-			kfree(kvalue);
-			return -EFAULT;
-		}
+		kvalue = memdup_user(value, size);
+		if (IS_ERR(kvalue))
+			return PTR_ERR(kvalue);
 	}
 
 	error = vfs_setxattr(d, kname, kvalue, size, flags);
-- 
1.5.4.rc3


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