[PATCH AUTOSEL 5.7 243/388] scsi: core: Fix incorrect usage of shost_for_each_device

Sasha Levin
2020-06-18T02:38:37Z

From: Ye Bin <yebin10@huawei.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@acm.org>
Signed-off-by: Ye Bin <yebin10@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 978be1602f71..927b1e641842 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 3ecdae18597d..b8b4366f1200 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