target: fix buffer offset in core_scsi3_pri_read_full_status

When at least two initiators register pr on the same LUN,
the target returns the exception data due to buffer offset
error, therefore the initiator executes command 'sg_persist -s'
may cause the initiator to appear segfault error.

This fixes a regression originally introduced by:

  commit a85d667e58bddf73be84d1981b41eaac985ed216
  Author: Bart Van Assche <bart.vanassche@sandisk.com>
  Date:   Tue May 23 16:48:27 2017 -0700

      target: Use {get,put}_unaligned_be*() instead of open coding these functions

Signed-off-by: tangwenji <tang.wenji@zte.com.cn>
Cc: stable@vger.kernel.org # 4.13+
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index dd2cd80..9f25c9c 100644 (file)
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -4011,6 +4011,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
                 * Set the ADDITIONAL DESCRIPTOR LENGTH
                 */
                put_unaligned_be32(desc_len, &buf[off]);
+               off += 4;
                /*
                 * Size of full desctipor header minus TransportID
                 * containing $FABRIC_MOD specific) initiator device/port