From: Jörn Engel <joern@logfs.org>
Date: Wed, 15 Feb 2012 21:51:32 +0000 (-0500)
Subject: target: fix use after free in target_report_luns
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=382436f8804fe1cb20b9a2a811a10eb2d8554721;p=deliverable%2Flinux.git

target: fix use after free in target_report_luns

Fix possible NULL pointer dereference in target_report_luns failure path.

Signed-off-by: Joern Engel <joern@logfs.org>
Cc: stable@vger.kernel.org
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
---

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 27da4e4e07c6..b0572f480c04 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -690,12 +690,12 @@ int target_report_luns(struct se_task *se_task)
 	 * 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);