From 88fb2fa7db7510bf1078226ab48d162d9854f3d4 Mon Sep 17 00:00:00 2001 From: tangwenji Date: Wed, 16 Aug 2017 16:39:00 +0800 Subject: [PATCH] target: fix null pointer regression in core_tmr_drain_tmr_list 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 Date: Tue Feb 14 16:25:54 2017 -0800 target: Delete tmr from list before processing Signed-off-by: tangwenji Cc: stable@vger.kernel.org # 4.11+ Signed-off-by: Nicholas Bellinger --- drivers/target/target_core_tmr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/target/target_core_tmr.c b/drivers/target/target_core_tmr.c index e22847bd79b9..61909b23e959 100644 --- 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) {