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Patch "target/iscsi: Fix iSCSI task reassignment handling" has been added to the 4.9-stable tree

PATCH [email protected] 1 participant 1 message Nov 16, 2017

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This is a note to let you know that I've just added the patch titled

target/iscsi: Fix iSCSI task reassignment handling

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
target-iscsi-fix-iscsi-task-reassignment-handling.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From 59b6986dbfcdab96a971f9663221849de79a7556 Mon Sep 17 00:00:00 2001

From: Bart Van Assche <[email protected]>
Date: Thu, 5 Jan 2017 12:39:57 +0100
Subject: target/iscsi: Fix iSCSI task reassignment handling

From: Bart Van Assche <[email protected]>

commit 59b6986dbfcdab96a971f9663221849de79a7556 upstream.

Allocate a task management request structure for all task management requests, including task reassignment. This change avoids that the se_tmr->response assignment dereferences an uninitialized se_tmr pointer.

Reported-by Moshe David <[email protected]>
Signed-off-by Bart Van Assche <[email protected]>
Reviewed-by Hannes Reinecke <[email protected]>
Reviewed-by Christoph Hellwig <[email protected]>
Cc Moshe David <[email protected]>
Signed-off-by Nicholas Bellinger <[email protected]>
Signed-off-by Greg Kroah-Hartman <[email protected]>
---
 drivers/target/iscsi/iscsi_target.c |   19 +++++++------------
 include/target/target_core_base.h   |    1 +
 2 files changed, 8 insertions(+), 12 deletions(-)
drivers/target/iscsi/iscsi_target.c +7 -12
@@ -1940,7 +1940,7 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
 	struct iscsi_tm *hdr;
 	int out_of_order_cmdsn = 0, ret;
 	bool sess_ref = false;
-	u8 function;
+	u8 function, tcm_function = TMR_UNKNOWN;
 
 	hdr			= (struct iscsi_tm *) buf;
 	hdr->flags &= ~ISCSI_FLAG_CMD_FINAL;

@@ -1986,10 +1986,6 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
 	 * LIO-Target $FABRIC_MOD
 	 */
 	if (function != ISCSI_TM_FUNC_TASK_REASSIGN) {
-
-		u8 tcm_function;
-		int ret;
-
 		transport_init_se_cmd(&cmd->se_cmd, &iscsi_ops,
 				      conn->sess->se_sess, 0, DMA_NONE,
 				      TCM_SIMPLE_TAG, cmd->sense_buffer + 2);

@@ -2025,15 +2021,14 @@ iscsit_handle_task_mgt_cmd(struct iscsi_
 			return iscsit_add_reject_cmd(cmd,
 				ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 		}
-
-		ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req,
-					 tcm_function, GFP_KERNEL);
-		if (ret < 0)
-			return iscsit_add_reject_cmd(cmd,
+	}
+	ret = core_tmr_alloc_req(&cmd->se_cmd, cmd->tmr_req, tcm_function,
+				 GFP_KERNEL);
+	if (ret < 0)
+		return iscsit_add_reject_cmd(cmd,
 				ISCSI_REASON_BOOKMARK_NO_RESOURCES, buf);
 
-		cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
-	}
+	cmd->tmr_req->se_tmr_req = cmd->se_cmd.se_tmr_req;
 
 	cmd->iscsi_opcode	= ISCSI_OP_SCSI_TMFUNC;
 	cmd->i_state		= ISTATE_SEND_TASKMGTRSP;
include/target/target_core_base.h +1 -0
@@ -197,6 +197,7 @@ enum tcm_tmreq_table {
 	TMR_LUN_RESET		= 5,
 	TMR_TARGET_WARM_RESET	= 6,
 	TMR_TARGET_COLD_RESET	= 7,
+	TMR_UNKNOWN		= 0xff,
 };
 
 /* fabric independent task management response values */

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/target-iscsi-fix-iscsi-task-reassignment-handling.patch