linux-kernel - [PATCH] scsi: zfcp: fix use-after-free in zfcp_sysfs_port_remove

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Date:   Fri, 20 Nov 2020 15:48:53 +0800
From:   Qinglang Miao <miaoqinglang@...wei.com>
To:     Steffen Maier <maier@...ux.ibm.com>,
        Benjamin Block <bblock@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>
CC:     <linux-s390@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        "Qinglang Miao" <miaoqinglang@...wei.com>
Subject: [PATCH] scsi: zfcp: fix use-after-free in zfcp_sysfs_port_remove_store

kfree(port) is called in put_device(&port->dev) so that following
use would cause use-after-free bug.

the former put_device is redundant for device_unregister contains
put_device already. So just remove it to fix this.

Fixes: 83d4e1c33d93 ("[SCSI] zfcp: cleanup port sysfs attribute usage")
Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@...wei.com>
---
 drivers/s390/scsi/zfcp_sysfs.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index 8d9662e8b..06285e452 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -327,8 +327,6 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
 	list_del(&port->list);
 	write_unlock_irq(&adapter->port_list_lock);
 
-	put_device(&port->dev);
-
 	zfcp_erp_port_shutdown(port, 0, "syprs_1");
 	device_unregister(&port->dev);
  out:
-- 
2.23.0