linux-kernel - [PATCH 15/15] sysfs: Protect sysfs_refresh

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Date:	Sat,  7 Nov 2009 23:27:13 -0800
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Kay Sievers <kay.sievers@...y.org>, Greg KH <greg@...ah.com>,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	linux-fsdevel@...r.kernel.org,
	Eric Dumazet <eric.dumazet@...il.com>,
	Benjamin LaHaise <bcrl@...et.ca>,
	Serge Hallyn <serue@...ibm.com>,
	"Eric W. Biederman" <ebiederm@...well.aristanetworks.com>,
	"Eric W. Biederman" <ebiederm@...stanetworks.com>
Subject: [PATCH 15/15] sysfs: Protect sysfs_refresh_inode with inode mutex.

From: Eric W. Biederman <ebiederm@...well.aristanetworks.com>

In general everything that writes to vfs inodes holds the
inode mutex, so hold the inode mutex over sysfs_refresh_inode.
The sysfs data structures don't need this but it looks like the
vfs might.

Acked-by: Serge Hallyn <serue@...ibm.com>
Acked-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 fs/sysfs/inode.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 8197e1a..75516cd 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -237,9 +237,11 @@ int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *sta
 	struct sysfs_dirent *sd = dentry->d_fsdata;
 	struct inode *inode = dentry->d_inode;
 
+	mutex_lock(&inode->i_mutex);
 	mutex_lock(&sysfs_mutex);
 	sysfs_refresh_inode(sd, inode);
 	mutex_unlock(&sysfs_mutex);
+	mutex_unlock(&inode->i_mutex);
 
 	generic_fillattr(inode, stat);
 	return 0;
@@ -349,9 +351,11 @@ int sysfs_permission(struct inode *inode, int mask)
 {
 	struct sysfs_dirent *sd = inode->i_private;
 
+	mutex_lock(&inode->i_mutex);
 	mutex_lock(&sysfs_mutex);
 	sysfs_refresh_inode(sd, inode);
 	mutex_unlock(&sysfs_mutex);
+	mutex_unlock(&inode->i_mutex);
 
 	return generic_permission(inode, mask, NULL);
 }
-- 
1.6.5.2.143.g8cc62

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