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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 <ebiederm@xmission.com>
Cc: Glauber Costa <glommer@parallels.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Andrew Morton 2012-07-09 16:13:36 -07:00 committed by Greg Kroah-Hartman
parent e5bcac6147
commit 17f79be93d
1 changed files with 5 additions and 3 deletions
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8
fs/sysfs/dir.c
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@ -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: