linux-kernel - [PATCH 4.14 113/193] target: fix null pointer regression in core_tmr_drain_tmr

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Message-Id: <20171128100618.489564618@linuxfoundation.org>
Date:   Tue, 28 Nov 2017 11:26:00 +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, tangwenji <tang.wenji@....com.cn>,
        Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 4.14 113/193] target: fix null pointer regression in core_tmr_drain_tmr_list

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

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

From: tangwenji <tang.wenji@....com.cn>

commit 88fb2fa7db7510bf1078226ab48d162d9854f3d4 upstream.

The target system kernel crash when the initiator executes
the sg_persist -A command,because of the second argument to
be set to NULL when core_tmr_lun_reset is called in
core_scsi3_pro_preempt function.

This fixes a regression originally introduced by:

  commit 51ec502a32665fed66c7f03799ede4023b212536
  Author: Bart Van Assche <bart.vanassche@...disk.com>
  Date:   Tue Feb 14 16:25:54 2017 -0800

      target: Delete tmr from list before processing

Signed-off-by: tangwenji <tang.wenji@....com.cn>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/target_core_tmr.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/target/target_core_tmr.c
+++ b/drivers/target/target_core_tmr.c
@@ -217,7 +217,8 @@ static void core_tmr_drain_tmr_list(
 	 * LUN_RESET tmr..
 	 */
 	spin_lock_irqsave(&dev->se_tmr_lock, flags);
-	list_del_init(&tmr->tmr_list);
+	if (tmr)
+		list_del_init(&tmr->tmr_list);
 	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
 		cmd = tmr_p->task_cmd;
 		if (!cmd) {