linux-kernel - [PATCH v2] [hv] storvsc: Payload buffer incorrectly sized for 32 bit kernels.

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Date:   Wed, 23 Nov 2016 08:46:33 -0500
From:   Cathy Avery <cavery@...hat.com>
To:     kys@...rosoft.com, haiyangz@...rosoft.com, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
        linux-scsi@...r.kernel.org
Subject: [PATCH v2] [hv] storvsc: Payload buffer incorrectly sized for 32 bit kernels.

On a 32 bit kernel sizeof(void *) is not 64 bits as hv_mpb_array
requires. Also the buffer needs to be cleared or the upper bytes
will contain junk.

Suggested-by: Vitaly Kuznetsov <vkuznets@...hat.com>
Signed-off-by: Cathy Avery <cavery@...hat.com>

ChangeLog:

v1) Initial submission
v2) Remove memset and replace kmalloc with kzalloc.
---
 drivers/scsi/storvsc_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8ccfc9e..05526b7 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1495,9 +1495,9 @@ static int storvsc_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *scmnd)
 	if (sg_count) {
 		if (sg_count > MAX_PAGE_BUFFER_COUNT) {
 
-			payload_sz = (sg_count * sizeof(void *) +
+			payload_sz = (sg_count * sizeof(u64) +
 				      sizeof(struct vmbus_packet_mpb_array));
-			payload = kmalloc(payload_sz, GFP_ATOMIC);
+			payload = kzalloc(payload_sz, GFP_ATOMIC);
 			if (!payload)
 				return SCSI_MLQUEUE_DEVICE_BUSY;
 		}
-- 
2.5.0