linux-kernel - [PATCH 02/13] devpts: More obvious check for the system devpts in pty allocation

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Message-Id: <1459819769-30387-2-git-send-email-ebiederm@xmission.com>
Date:	Mon,  4 Apr 2016 20:29:18 -0500
From:	"Eric W. Biederman" <ebiederm@...ssion.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Peter Hurley <peter@...leysoftware.com>,
	Greg KH <greg@...ah.com>, Jiri Slaby <jslaby@...e.com>,
	Aurelien Jarno <aurelien@...el32.net>,
	Andy Lutomirski <luto@...capital.net>,
	Florian Weimer <fw@...eb.enyo.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Serge Hallyn <serge.hallyn@...ntu.com>,
	Jann Horn <jann@...jh.net>,
	"security@...nel.org" <security@...nel.org>, security@...ntu.com,
	security@...ian.org, Willy Tarreau <w@....eu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: [PATCH 02/13] devpts: More obvious check for the system devpts in pty allocation

This makes the logic of the test clearer, and removes a confusing
use of opts.newinstance, which allows later changes not to worry
if newinstance is set on the primary mount of devpts or not.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 fs/devpts/inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index c14d51795577..9f22c959d1f7 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -622,7 +622,7 @@ retry:
 
 	mutex_lock(&allocated_ptys_lock);
 	if (pty_count >= pty_limit -
-			(fsi->mount_opts.newinstance ? pty_reserve : 0)) {
+			((devpts_mnt->mnt_sb == sb) ? pty_reserve : 0)) {
 		mutex_unlock(&allocated_ptys_lock);
 		return -ENOSPC;
 	}
-- 
2.6.3