target: Fix caw_sem leak in transport_generic_request_failure

With the recent addition of transport_check_aborted_status() within
transport_generic_request_failure() to avoid sending a SCSI status
exception after CMD_T_ABORTED w/ TAS=1 has occured, it introduced
a COMPARE_AND_WRITE early failure regression.

Namely when COMPARE_AND_WRITE fails and se_device->caw_sem has
been taken by sbc_compare_and_write(), if the new check for
transport_check_aborted_status() returns true and exits,
cmd->transport_complete_callback() -> compare_and_write_post()
is skipped never releasing se_device->caw_sem.

This regression was originally introduced by:

  commit e3b88ee95b4e4bf3e9729a4695d695b9c7c296c8
  Author: Bart Van Assche <bart.vanassche@sandisk.com>
  Date:   Tue Feb 14 16:25:45 2017 -0800

      target: Fix handling of aborted failed commands

To address this bug, move the transport_check_aborted_status()
call after transport_complete_task_attr() and
cmd->transport_complete_callback().

Cc: Mike Christie <mchristi@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: stable@vger.kernel.org # 4.11+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index c33d1e95dd17..d02218c71dd6 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1729,9 +1729,6 @@ void transport_generic_request_failure(struct se_cmd *cmd,
 {
         int ret = 0, post_ret = 0;
 
-        if (transport_check_aborted_status(cmd, 1))
-                return;
-
         pr_debug("-----[ Storage Engine Exception; sense_reason %d\n",
                  sense_reason);
         target_show_cmd("-----[ ", cmd);
@@ -1740,6 +1737,7 @@ void transport_generic_request_failure(struct se_cmd *cmd,
          * For SAM Task Attribute emulation for failed struct se_cmd
          */
         transport_complete_task_attr(cmd);
+
         /*
          * Handle special case for COMPARE_AND_WRITE failure, where the
          * callback is expected to drop the per device ->caw_sem.
@@ -1748,6 +1746,9 @@ void transport_generic_request_failure(struct se_cmd *cmd,
              cmd->transport_complete_callback)
                 cmd->transport_complete_callback(cmd, false, &post_ret);
 
+        if (transport_check_aborted_status(cmd, 1))
+                return;
+
         switch (sense_reason) {
         case TCM_NON_EXISTENT_LUN:
         case TCM_UNSUPPORTED_SCSI_OPCODE: