Patch "proc: Fix unbalanced hard link numbers" has been added to the 4.9-stable tree

Patch "proc: Fix unbalanced hard link numbers" has been added to the 4.9-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    proc: Fix unbalanced hard link numbers

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     proc-fix-unbalanced-hard-link-numbers.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From d66bb1607e2d8d384e53f3d93db5c18483c8c4f7 Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@suse.de>
Date: Fri, 28 Apr 2017 15:00:15 +0200
Subject: proc: Fix unbalanced hard link numbers

From: Takashi Iwai <tiwai@suse.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@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>

---
 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--;


Patches currently in stable-queue which might be from tiwai@suse.de are

queue-4.9/proc-fix-unbalanced-hard-link-numbers.patch
queue-4.9/alsa-hda-fix-cpu-lockup-when-stopping-the-cmd-dmas.patch