linux-kernel - [ 44/56] SCSI: ibmvscsi: Fix host config length field overflow

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Message-Id: <20121004211157.134940545@linuxfoundation.org>
Date:	Thu,  4 Oct 2012 14:16:05 -0700
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,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>,
	James Bottomley <JBottomley@...allels.com>
Subject: [ 44/56] SCSI: ibmvscsi: Fix host config length field overflow

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

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

From: Benjamin Herrenschmidt <benh@...nel.crashing.org>

commit 225c56960fcafeccc2b6304f96cd3f0dbf42a16a upstream.

The length field in the host config packet is only 16-bit long, so
passing it 0x10000 (64K which is our standard PAGE_SIZE) doesn't
work and result in an empty config from the server.

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
Acked-by: Robert Jennings <rcj@...ux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/ibmvscsi/ibmvscsi.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -1541,6 +1541,9 @@ static int ibmvscsi_do_host_config(struc
 
 	host_config = &evt_struct->iu.mad.host_config;
 
+	/* The transport length field is only 16-bit */
+	length = min(0xffff, length);
+
 	/* Set up a lun reset SRP command */
 	memset(host_config, 0x00, sizeof(*host_config));
 	host_config->common.type = VIOSRP_HOST_CONFIG_TYPE;


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