linux-kernel - [PATCH 5.7 239/477] scsi: core: Fix incorrect usage of shost_for_each

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Date:   Tue, 23 Jun 2020 21:53:56 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
        Ye Bin <yebin10@...wei.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.7 239/477] scsi: core: Fix incorrect usage of shost_for_each_device

From: Ye Bin <yebin10@...wei.com>

[ Upstream commit 4dea170f4fb225984b4f2f1cf0a41d485177b905 ]

shost_for_each_device(sdev, shost) \
	for ((sdev) = __scsi_iterate_devices((shost), NULL); \
	     (sdev); \
	     (sdev) = __scsi_iterate_devices((shost), (sdev)))

When terminating shost_for_each_device() iteration with break or return,
scsi_device_put() should be used to prevent stale scsi device references
from being left behind.

Link: https://lore.kernel.org/r/20200518074420.39275-1-yebin10@huawei.com
Reviewed-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Ye Bin <yebin10@...wei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/scsi_error.c | 2 ++
 drivers/scsi/scsi_lib.c   | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index 978be1602f718..927b1e6418423 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -1412,6 +1412,7 @@ static int scsi_eh_stu(struct Scsi_Host *shost,
 				sdev_printk(KERN_INFO, sdev,
 					    "%s: skip START_UNIT, past eh deadline\n",
 					    current->comm));
+			scsi_device_put(sdev);
 			break;
 		}
 		stu_scmd = NULL;
@@ -1478,6 +1479,7 @@ static int scsi_eh_bus_device_reset(struct Scsi_Host *shost,
 				sdev_printk(KERN_INFO, sdev,
 					    "%s: skip BDR, past eh deadline\n",
 					     current->comm));
+			scsi_device_put(sdev);
 			break;
 		}
 		bdr_scmd = NULL;
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 3ecdae18597d1..b8b4366f12001 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -2865,8 +2865,10 @@ scsi_host_unblock(struct Scsi_Host *shost, int new_state)
 
 	shost_for_each_device(sdev, shost) {
 		ret = scsi_internal_device_unblock(sdev, new_state);
-		if (ret)
+		if (ret) {
+			scsi_device_put(sdev);
 			break;
+		}
 	}
 	return ret;
 }
-- 
2.25.1