[3.11.y.z extended stable] Patch "target: Fix left-over se_lun->lun_sep pointer OOPs" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    target: Fix left-over se_lun->lun_sep pointer OOPs

to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.11.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From b2c653e6d2d08b1865433b05f5c6055459ba6b0e Mon Sep 17 00:00:00 2001
From: Nicholas Bellinger <nab at linux-iscsi.org>
Date: Mon, 16 Jun 2014 20:25:54 +0000
Subject: target: Fix left-over se_lun->lun_sep pointer OOPs

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 at gmx.de>
Tested-by: Sebastian Herbszt <herbszt at gmx.de>
Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/target/target_core_device.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 2640f2c65329..8a6b0e9f526a 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -614,6 +614,7 @@ void core_dev_unexport(
 	dev->export_count--;
 	spin_unlock(&hba->device_lock);

+	lun->lun_sep = NULL;
 	lun->lun_se_dev = NULL;
 }

--
1.9.1