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

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Message-Id: <1479836185-6741-1-git-send-email-cavery@redhat.com>
Date:   Tue, 22 Nov 2016 12:36:25 -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] [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
could contain junk.

Suggested-by: Vitaly Kuznets <vkuznets@...hat.com>
Signed-off-by: Cathy Avery <cavery@...hat.com>
---
 drivers/scsi/storvsc_drv.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8ccfc9e..b4a8c9d 100644
--- a/drivers/scsi/storvsc_drv.c
+++ b/drivers/scsi/storvsc_drv.c
@@ -1495,11 +1495,12 @@ 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);
 			if (!payload)
 				return SCSI_MLQUEUE_DEVICE_BUSY;
+			memset(payload, 0, payload_sz);
 		}
 
 		payload->range.len = length;
-- 
2.5.0