linux-kernel - [PATCH 4.4 135/210] vfs: show_vfsstat: do not ignore errors from show

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Message-Id: <20160410183531.425024285@linuxfoundation.org>
Date:	Sun, 10 Apr 2016 11:35:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, "Dmitry V. Levin" <ldv@...linux.org>,
	Al Viro <viro@...iv.linux.org.uk>
Subject: [PATCH 4.4 135/210] vfs: show_vfsstat: do not ignore errors from show_devname method

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

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

From: Dmitry V. Levin <ldv@...linux.org>

commit 5f8d498d4364f544fee17125787a47553db02afa upstream.

Explicitly check show_devname method return code and bail out in case
of an error.  This fixes regression introduced by commit 9d4d65748a5c.

Signed-off-by: Dmitry V. Levin <ldv@...linux.org>
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/proc_namespace.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/fs/proc_namespace.c
+++ b/fs/proc_namespace.c
@@ -197,6 +197,8 @@ static int show_vfsstat(struct seq_file
 	if (sb->s_op->show_devname) {
 		seq_puts(m, "device ");
 		err = sb->s_op->show_devname(m, mnt_path.dentry);
+		if (err)
+			goto out;
 	} else {
 		if (r->mnt_devname) {
 			seq_puts(m, "device ");