linux-kernel - [PATCH 3.2 103/125] target: Fix left-over se_lun->lun

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Message-ID: <lsq.1404846110.383976994@decadent.org.uk>
Date:	Tue, 08 Jul 2014 20:01:50 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Nicholas Bellinger" <nab@...ux-iscsi.org>,
	"Sebastian Herbszt" <herbszt@....de>
Subject: [PATCH 3.2 103/125] target: Fix left-over se_lun->lun_sep pointer
 OOPs

3.2.61-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Nicholas Bellinger <nab@...ux-iscsi.org>

commit 83ff42fcce070801a3aa1cd6a3269d7426271a8d upstream.

This patch fixes a left-over se_lun->lun_sep pointer OOPs when one
of the /sys/kernel/config/target/$FABRIC/$WWPN/$TPGT/lun/$LUN/alua*
attributes is accessed after the $DEVICE symlink has been removed.

To address this bug, go ahead and clear se_lun->lun_sep memory in
core_dev_unexport(), so that the existing checks for show/store
ALUA attributes in target_core_fabric_configfs.c work as expected.

Reported-by: Sebastian Herbszt <herbszt@....de>
Tested-by: Sebastian Herbszt <herbszt@....de>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/target_core_device.c | 1 +
 1 file changed, 1 insertion(+)

--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -646,6 +646,7 @@ void core_dev_unexport(
 	spin_unlock(&dev->se_port_lock);
 
 	se_dev_stop(dev);
+	lun->lun_sep = NULL;
 	lun->lun_se_dev = NULL;
 }
 

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