From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 28 Apr 2017 13:00:15 +0000 (+0200)
Subject: proc: Fix unbalanced hard link numbers
X-Git-Tag: v4.12-rc1~94^2
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=d66bb1607e2d8d384e53f3d93db5c18483c8c4f7;p=uclinux-h8%2Flinux.git

proc: Fix unbalanced hard link numbers

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...")
Cc: stable@vger.kernel.org
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>
---

diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index ee27feb34cf4..9425c0d97262 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -472,6 +472,7 @@ 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--;