Patch "target/iscsi: Detect conn_cmd_list corruption early" has been added to the 4.14-stable tree

Patch "target/iscsi: Detect conn_cmd_list corruption early" has been added to the 4.14-stable tree

[gregkh]

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

    target/iscsi: Detect conn_cmd_list corruption early

to the 4.14-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-detect-conn_cmd_list-corruption-early.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Dec 18 13:28:59 CET 2017
From: Bart Van Assche <bart.vanassche@wdc.com>
Date: Tue, 31 Oct 2017 11:03:18 -0700
Subject: target/iscsi: Detect conn_cmd_list corruption early

From: Bart Van Assche <bart.vanassche@wdc.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@wdc.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Christie <mchristi@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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);


Patches currently in stable-queue which might be from bart.vanassche@wdc.com are

queue-4.14/ib-core-fix-endianness-annotation-in-rdma_is_multicast_addr.patch
queue-4.14/target-iscsi-detect-conn_cmd_list-corruption-early.patch
queue-4.14/target-iscsi-fix-a-race-condition-in-iscsit_add_reject_from_cmd.patch
queue-4.14/rdma-cma-avoid-triggering-undefined-behavior.patch
queue-4.14/scsi-core-fix-a-scsi_show_rq-null-pointer-dereference.patch
queue-4.14/blk-mq-sched-dispatch-from-scheduler-iff-progress-is-made-in-dispatch.patch