From: Sagi Grimberg <sagi@grimberg.me>
Date: Wed, 1 Apr 2020 16:16:27 -0700
Subject: [PATCH] nvmet: fix NULL dereference when removing a referral
Git-commit: f0e656e4f253120eb871a53ffab7664530c1d9f4
Patch-mainline: v5.7-rc1
References: bsc#1169045

When item release is called, the parent is already null.  We need the
parent to pass to nvmet_referral_disable so hook it up to
->disconnect_notify.

Reported-by: Tony Asleson <tasleson@redhat.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/nvme/target/configfs.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/configfs.c b/drivers/nvme/target/configfs.c
index 7aa10788b7c8..58cabd7b6fc5 100644
--- a/drivers/nvme/target/configfs.c
+++ b/drivers/nvme/target/configfs.c
@@ -1098,12 +1098,19 @@ static struct configfs_attribute *nvmet_referral_attrs[] = {
 	NULL,
 };
 
-static void nvmet_referral_release(struct config_item *item)
+static void nvmet_referral_notify(struct config_group *group,
+		struct config_item *item)
 {
 	struct nvmet_port *parent = to_nvmet_port(item->ci_parent->ci_parent);
 	struct nvmet_port *port = to_nvmet_port(item);
 
 	nvmet_referral_disable(parent, port);
+}
+
+static void nvmet_referral_release(struct config_item *item)
+{
+	struct nvmet_port *port = to_nvmet_port(item);
+
 	kfree(port);
 }
 
@@ -1134,6 +1141,7 @@ static struct config_group *nvmet_referral_make(
 
 static struct configfs_group_operations nvmet_referral_group_ops = {
 	.make_group		= nvmet_referral_make,
+	.disconnect_notify	= nvmet_referral_notify,
 };
 
 static const struct config_item_type nvmet_referrals_type = {
-- 
2.16.4