From 9ee332d99e4d5a97548943b81c54668450ce641b Mon Sep 17 00:00:00 2001
From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 18 Dec 2017 15:05:07 -0500
Subject: [PATCH] sget(): handle failures of register_shrinker()
Git-commit: 9ee332d99e4d5a97548943b81c54668450ce641b
Patch-mainline: v4.15-rc7
References: bsc#1052766

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Jan Kara <jack@suse.cz>

---
 fs/super.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/fs/super.c b/fs/super.c
index 7ff1349609e4..06bd25d90ba5 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -517,7 +517,11 @@ struct super_block *sget_userns(struct file_system_type *type,
 	hlist_add_head(&s->s_instances, &type->fs_supers);
 	spin_unlock(&sb_lock);
 	get_filesystem(type);
-	register_shrinker(&s->s_shrink);
+	err = register_shrinker(&s->s_shrink);
+	if (err) {
+		deactivate_locked_super(s);
+		s = ERR_PTR(err);
+	}
 	return s;
 }
 
-- 
2.13.6