linux-kernel - [ 61/61] target: Return error to initiator if SET TARGET PORT GROUPS emulation fails

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Message-Id: <20120620173026.161726264@linuxfoundation.org>
Date:	Wed, 20 Jun 2012 10:31:21 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Roland Dreier <roland@...estorage.com>,
	Andy Grover <agrover@...hat.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Ben Hutchings <ben@...adent.org.uk>
Subject: [ 61/61] target: Return error to initiator if SET TARGET PORT GROUPS emulation fails

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

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

commit 59e4f541baf728dbb426949bfa9f6862387ffd0e upstream.

The error paths in target_emulate_set_target_port_groups() are all
essentially "rc = -EINVAL; goto out;" but the code at "out:" ignores
rc and always returns success.  This means that even if eg explicit
ALUA is turned off, the initiator will always see a good SCSI status
for SET TARGET PORT GROUPS.

Fix this by returning rc as is intended.  It appears this bug was
added by the following patch:

commit 05d1c7c0d0db4cc25548d9aadebb416888a82327
Author: Andy Grover <agrover@...hat.com>
Date:   Wed Jul 20 19:13:28 2011 +0000

    target: Make all control CDBs scatter-gather

Signed-off-by: Roland Dreier <roland@...estorage.com>
Cc: Andy Grover <agrover@...hat.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
[bwh: Backported to 3.2: we have transport_complete_task()
 and not target_complete_cmd()]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/target_core_alua.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -351,9 +351,11 @@ int target_emulate_set_target_port_group
 
 out:
 	transport_kunmap_data_sg(cmd);
-	task->task_scsi_status = GOOD;
-	transport_complete_task(task, 1);
-	return 0;
+	if (!rc) {
+		task->task_scsi_status = GOOD;
+		transport_complete_task(task, 1);
+	}
+	return rc;
 }
 
 static inline int core_alua_state_nonoptimized(


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