From 17f79be93d95bb0e46bd08681ec9c9e601869c15 Mon Sep 17 00:00:00 2001 From: Andrew Morton Date: Mon, 9 Jul 2012 16:13:36 -0700 Subject: sysfs: fail dentry revalidation after namespace change fix don't assume that KOBJ_NS_TYPE_NONE==0. Also save a test-n-branch. Cc: Eric W. Biederman Cc: Glauber Costa Cc: Tejun Heo Signed-off-by: Andrew Morton Acked-by: Serge E. Hallyn Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/dir.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'fs/sysfs/dir.c') diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index c0bf38a21ca..1cdfb53199a 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -329,10 +329,12 @@ static int sysfs_dentry_revalidate(struct dentry *dentry, struct nameidata *nd) /* The sysfs dirent has been moved to a different namespace */ type = KOBJ_NS_TYPE_NONE; - if (sd->s_parent) + if (sd->s_parent) { type = sysfs_ns_type(sd->s_parent); - if (type && (sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns)) - goto out_bad; + if (type != KOBJ_NS_TYPE_NONE && + sysfs_info(dentry->d_sb)->ns[type] != sd->s_ns) + goto out_bad; + } mutex_unlock(&sysfs_mutex); out_valid: -- cgit v1.2.3