[ 078/149] target: fix use after free in target_report_luns

[Greg KH]

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

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

From: =?UTF-8?q?J=C3=B6rn=20Engel?= <joern@xxxxxxxxx>

commit 382436f8804fe1cb20b9a2a811a10eb2d8554721 upstream.

Fix possible NULL pointer dereference in target_report_luns failure path.

Signed-off-by: Joern Engel <joern@xxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/target/target_core_device.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -696,12 +696,12 @@ int target_report_luns(struct se_task *s
 	 * See SPC3 r07, page 159.
 	 */
 done:
-	transport_kunmap_data_sg(se_cmd);
 	lun_count *= 8;
 	buf[0] = ((lun_count >> 24) & 0xff);
 	buf[1] = ((lun_count >> 16) & 0xff);
 	buf[2] = ((lun_count >> 8) & 0xff);
 	buf[3] = (lun_count & 0xff);
+	transport_kunmap_data_sg(se_cmd);
 
 	se_task->task_scsi_status = GOOD;
 	transport_complete_task(se_task, 1);


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