linux-kernel - [PATCH AUTOSEL for 4.14 024/110] scsi: core: check for device state in __scsi_remove

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Message-ID: <20180203180015.29073-24-alexander.levin@microsoft.com>
Date:   Sat, 3 Feb 2018 18:00:39 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Hannes Reinecke <hare@...e.de>, Hannes Reinecke <hare@...e.com>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.14 024/110] scsi: core: check for device state
 in __scsi_remove_target()

From: Hannes Reinecke <hare@...e.de>

[ Upstream commit 81b6c999897919d5a16fedc018fe375dbab091c5 ]

As it turned out device_get() doesn't use kref_get_unless_zero(), so we
will be always getting a device pointer.  Consequently, we need to check
for the device state in __scsi_remove_target() to avoid tripping over
deleted objects.

Fixes: fbce4d97fd43 ("scsi: fixup kernel warning during rmmod()")
Reported-by: Jason Yan <yanaijie@...wei.com>
Signed-off-by: Hannes Reinecke <hare@...e.com>
Reviewed-by: Bart Van Assche <bart.vanassche@....com>
Reviewed-by: Ewan D. Milne <emilne@...hat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/scsi/scsi_sysfs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index f796bd61f3f0..40406c162d0d 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1383,7 +1383,10 @@ static void __scsi_remove_target(struct scsi_target *starget)
 		 * check.
 		 */
 		if (sdev->channel != starget->channel ||
-		    sdev->id != starget->id ||
+		    sdev->id != starget->id)
+			continue;
+		if (sdev->sdev_state == SDEV_DEL ||
+		    sdev->sdev_state == SDEV_CANCEL ||
 		    !get_device(&sdev->sdev_gendev))
 			continue;
 		spin_unlock_irqrestore(shost->host_lock, flags);
-- 
2.11.0