From: Qinglang Miao <miaoqinglang@huawei.com>
To: Steffen Maier <maier@linux.ibm.com>,
Benjamin Block <bblock@linux.ibm.com>,
Heiko Carstens <hca@linux.ibm.com>,
Vasily Gorbik <gor@linux.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>
Cc: <linux-s390@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
"Qinglang Miao" <miaoqinglang@huawei.com>
Subject: [PATCH] scsi: zfcp: fix use-after-free in zfcp_unit_remove
Date: Fri, 20 Nov 2020 15:48:54 +0800 [thread overview]
Message-ID: <20201120074854.31754-1-miaoqinglang@huawei.com> (raw)
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: 86bdf218a717 ("[SCSI] zfcp: cleanup unit sysfs attribute usage")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
---
drivers/s390/scsi/zfcp_unit.c | 2 --
1 file changed, 2 deletions(-)
diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c
index e67bf7388..664b77853 100644
--- a/drivers/s390/scsi/zfcp_unit.c
+++ b/drivers/s390/scsi/zfcp_unit.c
@@ -255,8 +255,6 @@ int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun)
scsi_device_put(sdev);
}
- put_device(&unit->dev);
-
device_unregister(&unit->dev);
return 0;
--
2.23.0
next reply other threads:[~2020-11-20 7:45 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-20 7:48 Qinglang Miao [this message]
2020-11-25 17:06 ` [PATCH] scsi: zfcp: fix use-after-free in zfcp_unit_remove Benjamin Block
2020-11-26 1:27 ` Qinglang Miao
2020-11-26 8:13 ` Cornelia Huck
2020-11-26 9:42 ` Benjamin Block
2020-11-26 12:07 ` Qinglang Miao
2020-11-26 15:12 ` Benjamin Block
2020-11-27 9:21 ` Steffen Maier
2020-12-01 2:46 ` Qinglang Miao
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