linux-kernel - [PATCH 4.14 153/167] scsi: core: check for device state in __scsi_remove

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Date:   Wed, 21 Feb 2018 13:49:24 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jason Yan <yanaijie@...wei.com>,
        Hannes Reinecke <hare@...e.com>,
        Bart Van Assche <bart.vanassche@....com>,
        "Ewan D. Milne" <emilne@...hat.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Max Ivanov <ivanov.maxim@...il.com>
Subject: [PATCH 4.14 153/167] scsi: core: check for device state in __scsi_remove_target()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 81b6c999897919d5a16fedc018fe375dbab091c5 upstream.

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>
Cc: Max Ivanov <ivanov.maxim@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi_sysfs.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -1383,7 +1383,10 @@ static void __scsi_remove_target(struct
 		 * 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);