target: accept REQUEST_SENSE with 18bytes

WindowsXP+BOT issues a MODE_SENSE request with page 0x1c which is not
suppoerted by target. Target rejects that command with
TCM_INVALID_CDB_FIELD, so far so good. On BOT I can't send the SENSE
response back, instead I can only reply that an error occured. The next
thing happens is a REQUEST_SENSE request with 18 bytes length. Since the
check here is more than 18 bytes I have to NACK that request as well.
This is not really required: We check for some additional room, but we
never use it. The additional length is set to 0xa so the total length is
0xa + 8 = 18 which is fine with my 18 bytes.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 4 insertions, 10 deletions

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index a9bbf5a5cc27..f3d71fa88a28 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -1058,11 +1058,8 @@ int target_emulate_request_sense(struct se_task *task)
                  */
                 buf[0] = 0x70;
                 buf[SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION;
-                /*
-                 * Make sure request data length is enough for additional
-                 * sense data.
-                 */
-                if (cmd->data_length <= 18) {
+
+                if (cmd->data_length < 18) {
                         buf[7] = 0x00;
                         err = -EINVAL;
                         goto end;
@@ -1079,11 +1076,8 @@ int target_emulate_request_sense(struct se_task *task)
                  */
                 buf[0] = 0x70;
                 buf[SPC_SENSE_KEY_OFFSET] = NO_SENSE;
-                /*
-                 * Make sure request data length is enough for additional
-                 * sense data.
-                 */
-                if (cmd->data_length <= 18) {
+
+                if (cmd->data_length < 18) {
                         buf[7] = 0x00;
                         err = -EINVAL;
                         goto end;