From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 18 Dec 2017 20:05:07 +0000 (-0500)
Subject: sget(): handle failures of register_shrinker()
X-Git-Tag: v4.1.51~92
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0ca00a61a3608ca07def8516b74b88ae685856dc;p=platform%2Fkernel%2Flinux-exynos.git

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 928c20f47af9..3fa6b945a34e 100644
--- 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;
 }