linux-kernel - [ 12/66] target: Re-add explict zeroing of INQUIRY bounce buffer memory

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Message-Id: <20121115040939.894865376@linuxfoundation.org>
Date:	Wed, 14 Nov 2012 20:10:17 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	alan@...rguk.ukuu.org.uk,
	Kelsey Prantis <kelsey.prantis@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Andy Grover <agrover@...hat.com>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [ 12/66] target: Re-add explict zeroing of INQUIRY bounce buffer memory

3.6-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>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/target/target_core_spc.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -605,6 +605,8 @@ static int spc_emulate_inquiry(struct se
 	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


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