sget(): handle failures of register_shrinker()
[ Upstream commit 9ee332d99e4d5a97548943b81c54668450ce641b ]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/fs/super.c b/fs/super.c
index 994db21..79d7fc5 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -522,7 +522,11 @@ 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;
}