target: allow underflow/overflow for PR OUT etc. commands

It's not necessarily a fatal error if a command with a data-out phase
has a data length that differs from the transport data length (e.g.
PERSISTENT RESERVE OUT might have a parameter list length in the CDB
that's smaller than the FC_DL field), so allow these commands.  The
Windows compliance test sends them.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Spencer Baugh <sbaugh@catern.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index 98155db..729ec73 100644 (file)
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1088,9 +1088,9 @@ target_cmd_size_check(struct se_cmd *cmd, unsigned int size)
                        " 0x%02x\n", cmd->se_tfo->get_fabric_name(),
                                cmd->data_length, size, cmd->t_task_cdb[0]);
 
-               if (cmd->data_direction == DMA_TO_DEVICE) {
-                       pr_err("Rejecting underflow/overflow"
-                                       " WRITE data\n");
+               if (cmd->data_direction == DMA_TO_DEVICE &&
+                   cmd->se_cmd_flags & SCF_SCSI_DATA_CDB) {
+                       pr_err("Rejecting underflow/overflow WRITE data\n");
                        return TCM_INVALID_CDB_FIELD;
                }
                /*