[PATCH 3.11 039/128] iscsi-target: Avoid rejecting incorrect ITT for Data-Out

From: Luis Henriques
Date: Thu Jul 24 2014 - 06:19:24 EST -stable review patch. If anyone has any objections, please let me know.


From: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>

commit 97c99b47ac58bacb7c09e1f47d5d184434f6b06a upstream.

This patch changes iscsit_check_dataout_hdr() to dump the incoming
Data-Out payload when the received ITT is not associated with a
WRITE, instead of calling iscsit_reject_cmd() for the non WRITE
ITT descriptor.

This addresses a bug where an initiator sending an Data-Out for
an ITT associated with a READ would end up generating a reject
for the READ, eventually resulting in list corruption.

Reported-by: Santosh Kulkarni <santosh.kulkarni@xxxxxxxxxxxxxx>
Reported-by: Arshad Hussain <arshad.hussain@xxxxxxxxxxxxxx>
Signed-off-by: Nicholas Bellinger <nab@xxxxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
drivers/target/iscsi/iscsi_target.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c
index a5825ea2488e..5283359ef299 100644
--- a/drivers/target/iscsi/iscsi_target.c
+++ b/drivers/target/iscsi/iscsi_target.c
@@ -1317,7 +1317,7 @@ iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
if (cmd->data_direction != DMA_TO_DEVICE) {
pr_err("Command ITT: 0x%08x received DataOUT for a"
" NON-WRITE command.\n", cmd->init_task_tag);
- return iscsit_reject_cmd(cmd, ISCSI_REASON_PROTOCOL_ERROR, buf);
+ return iscsit_dump_data_payload(conn, payload_length, 1);
se_cmd = &cmd->se_cmd;

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