linux-kernel - [PATCH] target: allow underflow/overflow for PR OUT etc. commands

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Message-Id: <1437602898-15229-4-git-send-email-sbaugh@catern.com>
Date:	Wed, 22 Jul 2015 15:08:18 -0700
From:	Spencer Baugh <sbaugh@...ern.com>
To:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>,
	linux-scsi@...r.kernel.org (open list:TARGET SUBSYSTEM),
	target-devel@...r.kernel.org (open list:TARGET SUBSYSTEM),
	linux-kernel@...r.kernel.org (open list)
Cc:	Joern Engel <joern@...estorage.com>,
	Spencer Baugh <Spencer.baugh@...estorage.com>,
	Roland Dreier <roland@...estorage.com>,
	Spencer Baugh <sbaugh@...ern.com>
Subject: [PATCH] target: allow underflow/overflow for PR OUT etc. commands

From: Roland Dreier <roland@...estorage.com>

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@...estorage.com>
Signed-off-by: Spencer Baugh <sbaugh@...ern.com>
---
 drivers/target/target_core_transport.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/target/target_core_transport.c b/drivers/target/target_core_transport.c
index ac002a7..f6626bb 100644
--- a/drivers/target/target_core_transport.c
+++ b/drivers/target/target_core_transport.c
@@ -1087,9 +1087,9 @@ 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;
 		}
 		/*
-- 
2.5.0.rc3

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