linux-kernel - [RFC][PATCH v1 1/9] vfs: extend vfs

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Message-Id: <1327961644-6886-2-git-send-email-zohar@linux.vnet.ibm.com>
Date:	Mon, 30 Jan 2012 17:13:56 -0500
From:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
To:	linux-security-module@...r.kernel.org
Cc:	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	David Safford <safford@...son.ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	Mimi Zohar <zohar@...ibm.com>,
	Dmitry Kasatkin <dmitry.kasatkin@...ia.com>
Subject: [RFC][PATCH v1 1/9] vfs: extend vfs_removexattr locking

This patch takes the i_mutex lock before security_inode_removexattr(),
instead of after, in preparation of calling ima_inode_removexattr().

Signed-off-by: Mimi Zohar <zohar@...ibm.com>
Signed-off-by: Dmitry Kasatkin <dmitry.kasatkin@...ia.com>
---
 fs/xattr.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c
index 82f4337..6112c92 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -294,11 +294,13 @@ vfs_removexattr(struct dentry *dentry, const char *name)
 	if (error)
 		return error;
 
+	mutex_lock(&inode->i_mutex);
 	error = security_inode_removexattr(dentry, name);
-	if (error)
+	if (error) {
+		mutex_unlock(&inode->i_mutex);
 		return error;
+	}
 
-	mutex_lock(&inode->i_mutex);
 	error = inode->i_op->removexattr(dentry, name);
 	mutex_unlock(&inode->i_mutex);
 
-- 
1.7.6.5

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