proc: Fix unbalanced hard link numbers

commit d66bb1607e2d8d384e53f3d93db5c18483c8c4f7 upstream.

proc_create_mount_point() forgot to increase the parent's nlink, and
it resulted in unbalanced hard link numbers, e.g. /proc/fs shows one
less than expected.

Fixes: eb6d38d5427b ("proc: Allow creating permanently empty directories...")
Reported-by: Tristan Ye <tristan.ye@suse.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index ff3ffc76a93795b6662cb80d85f2a404d8f20693..3773335791da35ae4faedfb5afeb1a9274908b3e 100644 (file)
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -469,6 +469,7 @@ struct proc_dir_entry *proc_create_mount_point(const char *name)
                ent->data = NULL;
                ent->proc_fops = NULL;
                ent->proc_iops = NULL;
+               parent->nlink++;
                if (proc_register(parent, ent) < 0) {
                        kfree(ent);
                        parent->nlink--;