From 659038428cb43a66e3eff71e2c845c9de3611a98 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Tue, 3 Apr 2018 00:13:17 -0400
Subject: orangefs_kill_sb(): deal with allocation failures

From: Al Viro <viro@zeniv.linux.org.uk>

commit 659038428cb43a66e3eff71e2c845c9de3611a98 upstream.

orangefs_fill_sb() might've failed to allocate ORANGEFS_SB(s); don't
oops in that case.

Cc: stable@kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 fs/orangefs/super.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/fs/orangefs/super.c
+++ b/fs/orangefs/super.c
@@ -594,6 +594,11 @@ void orangefs_kill_sb(struct super_block
 	/* provided sb cleanup */
 	kill_anon_super(sb);
 
+	if (!ORANGEFS_SB(sb)) {
+		mutex_lock(&orangefs_request_mutex);
+		mutex_unlock(&orangefs_request_mutex);
+		return;
+	}
 	/*
 	 * issue the unmount to userspace to tell it to remove the
 	 * dynamic mount info it has for this superblock