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@microsoft.com>

diff --git a/fs/super.c b/fs/super.c
index 928c20f47af9c1e26906e7e3be7dfa7705e8ca15..3fa6b945a34e9b6af83f5e06f1be68d9c1c3e926 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -481,7 +481,11 @@ retry:
        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;
 }