linux-kernel - [PATCH 4.9 060/164] proc: Fix unbalanced hard link numbers

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Date:   Tue, 23 May 2017 22:07:57 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Tristan Ye <tristan.ye@...e.com>,
        Takashi Iwai <tiwai@...e.de>,
        "Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 4.9 060/164] proc: Fix unbalanced hard link numbers

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Takashi Iwai <tiwai@...e.de>

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@...e.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Eric W. Biederman <ebiederm@...ssion.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/proc/generic.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -471,6 +471,7 @@ struct proc_dir_entry *proc_create_mount
 		ent->data = NULL;
 		ent->proc_fops = NULL;
 		ent->proc_iops = NULL;
+		parent->nlink++;
 		if (proc_register(parent, ent) < 0) {
 			kfree(ent);
 			parent->nlink--;