From: Sagi Grimberg <sagi@grimberg.me>
Date: Mon, 24 Aug 2020 22:47:25 +0000 (-0700)
Subject: nvme: Fix NULL dereference for pci nvme controllers
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=7cd49f7576b0c61d6c4a2114cda08cc4d5ce0028;p=linux.git

nvme: Fix NULL dereference for pci nvme controllers

PCIe controllers do not have fabric opts, verify they exist before
showing ctrl_loss_tmo or reconnect_delay attributes.

Fixes: 764075fdcb2f ("nvme: expose reconnect_delay and ctrl_loss_tmo via sysfs")
Reported-by: Tobias Markus <tobias@markus-regensburg.de>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
---

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 537dcd900cb53..e406c3cf55bc1 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3676,6 +3676,10 @@ static umode_t nvme_dev_attrs_are_visible(struct kobject *kobj,
 		return 0;
 	if (a == &dev_attr_hostid.attr && !ctrl->opts)
 		return 0;
+	if (a == &dev_attr_ctrl_loss_tmo.attr && !ctrl->opts)
+		return 0;
+	if (a == &dev_attr_reconnect_delay.attr && !ctrl->opts)
+		return 0;
 
 	return a->mode;
 }