sysfs: allow creating symlinks from untagged to tagged directories

Supporting symlinks from untagged to tagged directories is reasonable,
and needed to support CONFIG_SYSFS_DEPRECATED.  So don't fail a prior
allowing that case to work.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index 660383321347..a7ac78f8e67a 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -67,7 +67,8 @@ static int sysfs_do_create_link(struct kobject *kobj, struct kobject *target,
 
         sysfs_addrm_start(&acxt, parent_sd);
         /* Symlinks must be between directories with the same ns_type */
-        if (ns_type == sysfs_ns_type(sd->s_symlink.target_sd->s_parent)) {
+        if (!ns_type ||
+            (ns_type == sysfs_ns_type(sd->s_symlink.target_sd->s_parent))) {
                 if (warn)
                         error = sysfs_add_one(&acxt, sd);
                 else