linux-kernel - [PATCH 0/2] target: Bug-fixes for v4.11-rc

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Date:   Thu, 30 Mar 2017 08:29:52 +0000
From:   "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:     target-devel <target-devel@...r.kernel.org>
Cc:     linux-scsi <linux-scsi@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Rob Millner <rlm@...erainc.com>, Chu Yuan Lin <cyl@...era.io>,
        James Shen <jcs@...era.io>,
        Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 0/2] target: Bug-fixes for v4.11-rc

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

Hi all,

Here are two additional target bug-fixes that have been found
by the DATERA Q/A + automation team during extended longevity
and stress testing atop v4.1.y stable code.

The first is a iscsi-target specific TMR reference leak during
session shutdown when se_cmd quiesce occured before hand-off
back to iscsi-target, that results in se_tmr_req descriptors
being left after se_cmd was freed.

This would manifest as kernel paging OOPsen during LUN_RESET
after the leak occured, because the associated se_tmr_req had
not been released even though the pre-allocated parent se_cmd
descriptor had already been freed during session shutdown.

The second is a race between se_lun configfs unlink shutdown
when se_lun->lun_ref percpu_ref RCU grace period is happening,
and user-space attempts to add a new NodeACL mappedlun configfs
symlink while se_lun shutdown is occuring.

This would manifest as NULL pointer dereference OOPsen within
target_stat_scsi_att_intr_port_show_attr_dev() after a new
NodeACL mappedlun was added to a se_lun that had already
been shutdown.

Both have been verified on v4.1.y stable code, and forward
ported to v4.11-rc.

Please review.

--nab

Nicholas Bellinger (2):
  iscsi-target: Fix TMR reference leak during session shutdown
  target: Avoid mappedlun symlink creation during lun shutdown

 drivers/target/iscsi/iscsi_target_util.c     | 12 +++++++-----
 drivers/target/target_core_fabric_configfs.c |  5 +++++
 drivers/target/target_core_tpg.c             |  4 ++++
 include/target/target_core_base.h            |  1 +
 4 files changed, 17 insertions(+), 5 deletions(-)

-- 
1.9.1