From htejun@gmail.com Mon Aug 20 05:36:51 2007 From: Tejun Heo Date: Mon, 20 Aug 2007 21:36:29 +0900 Subject: [PATCH 01/14] sysfs: fix i_mutex locking in sysfs_get_dentry() To: ebiederm@xmission.com, cornelia.huck@de.ibm.com, greg@kroah.com, linux-kernel@vger.kernel.org, satyam@infradead.org, stern@rowland.harvard.edu, containers@lists.osdl.org, htejun@gmail.com Cc: Tejun Heo Message-ID: <11876133893733-git-send-email-htejun@gmail.com> lookup_one_len_kern() should be called with the parent's i_mutex locked. Fix it. Spotted by Eric W. Biederman. Signed-off-by: Tejun Heo Cc: Eric W. Biederman Cc: Cornelia Huck Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -130,8 +130,10 @@ struct dentry *sysfs_get_dentry(struct s /* look it up */ parent_dentry = dentry; + mutex_lock(&parent_dentry->d_inode->i_mutex); dentry = lookup_one_len_kern(cur->s_name, parent_dentry, strlen(cur->s_name)); + mutex_unlock(&parent_dentry->d_inode->i_mutex); dput(parent_dentry); if (IS_ERR(dentry)) {