sget(): handle failures of register_shrinker()

Signed-off-by: Al Viro <[email protected]>
ambv · Dec 18, 2017 · 9ee332d · 9ee332d
1 parent bb422a7
commit 9ee332d
Showing 1 changed file with 5 additions and 1 deletion.
diff --git 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;
 }