linux-kernel - [PATCH 265/270] target: Re-add explict zeroing of INQUIRY bounce buffer memory

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Date:	Mon, 26 Nov 2012 14:59:15 -0200
From:	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Kelsey Prantis <kelsey.prantis@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Grover <agrover@...hat.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>,
	Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
Subject: [PATCH 265/270] target: Re-add explict zeroing of INQUIRY bounce buffer memory

3.5.7u1 -stable review patch.  If anyone has any objections, please let me know.

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

From: Nicholas Bellinger <nab@...ux-iscsi.org>

commit dea5f0998aa82bdeca260b87c653db11e91329b2 upstream.

This patch fixes a regression in spc_emulate_inquiry() code where the
local scope bounce buffer was no longer getting it's memory zeroed,
causing various problems with SCSI initiators that depend upon areas
of INQUIRY EVPD=0x83 payload having been zeroed.

This bug was introduced with the following v3.7-rc1 patch + CC'ed
stable commit:

commit ffe7b0e9326d9c68f5688bef691dd49f1e0d3651
Author: Paolo Bonzini <pbonzini@...hat.com>
Date:   Fri Sep 7 17:30:38 2012 +0200

    target: support zero allocation length in INQUIRY

Go ahead and re-add the missing memset of bounce buffer memory to be
copied into the outgoing se_cmd descriptor kmapped SGL payload.

Reported-by: Kelsey Prantis <kelsey.prantis@...el.com>
Cc: Kelsey Prantis <kelsey.prantis@...el.com>
Cc: Paolo Bonzini <pbonzini@...hat.com>
Cc: Andy Grover <agrover@...hat.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
[ herton: code to be patched is in target_core_cdb.c on 3.5 ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@...onical.com>
---
 drivers/target/target_core_cdb.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/target/target_core_cdb.c b/drivers/target/target_core_cdb.c
index 3dc3393..dd09f0f 100644
--- a/drivers/target/target_core_cdb.c
+++ b/drivers/target/target_core_cdb.c
@@ -610,6 +610,8 @@ int target_emulate_inquiry(struct se_cmd *cmd)
 	unsigned char buf[SE_INQUIRY_BUF];
 	int p, ret;
 
+	memset(buf, 0, SE_INQUIRY_BUF);
+
 	if (dev == tpg->tpg_virt_lun0.lun_se_dev)
 		buf[0] = 0x3f; /* Not connected */
 	else
-- 
1.7.9.5

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