linux-kernel - [PATCH 4.14 072/178] target/iscsi: Detect conn_cmd

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Date:   Mon, 18 Dec 2017 16:48:28 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bart Van Assche <bart.vanassche@....com>,
        Christoph Hellwig <hch@....de>,
        Mike Christie <mchristi@...hat.com>,
        Hannes Reinecke <hare@...e.com>,
        Nicholas Bellinger <nab@...ux-iscsi.org>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 072/178] target/iscsi: Detect conn_cmd_list corruption early

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

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

From: Bart Van Assche <bart.vanassche@....com>


[ Upstream commit 6eaf69e4ec075f5af236c0c89f75639a195db904 ]

Certain behavior of the initiator can cause the target driver to
send both a reject and a SCSI response. If that happens two
target_put_sess_cmd() calls will occur without the command having
been removed from conn_cmd_list. In other words, conn_cmd_list
will get corrupted once the freed memory is reused. Although the
Linux kernel can detect list corruption if list debugging is
enabled, in this case the context in which list corruption is
detected is not related to the context that caused list corruption.
Hence add WARN_ON() statements that report the context that is
causing list corruption.

Signed-off-by: Bart Van Assche <bart.vanassche@....com>
Cc: Christoph Hellwig <hch@....de>
Cc: Mike Christie <mchristi@...hat.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/target/iscsi/iscsi_target_util.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/target/iscsi/iscsi_target_util.c
+++ b/drivers/target/iscsi/iscsi_target_util.c
@@ -694,6 +694,8 @@ void iscsit_release_cmd(struct iscsi_cmd
 	struct iscsi_session *sess;
 	struct se_cmd *se_cmd = &cmd->se_cmd;
 
+	WARN_ON(!list_empty(&cmd->i_conn_node));
+
 	if (cmd->conn)
 		sess = cmd->conn->sess;
 	else
@@ -716,6 +718,8 @@ void __iscsit_free_cmd(struct iscsi_cmd
 {
 	struct iscsi_conn *conn = cmd->conn;
 
+	WARN_ON(!list_empty(&cmd->i_conn_node));
+
 	if (cmd->data_direction == DMA_TO_DEVICE) {
 		iscsit_stop_dataout_timer(cmd);
 		iscsit_free_r2ts_from_list(cmd);