scsi: 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@redhat.com>
Signed-off-by: Cathy Avery <cavery@redhat.com>
Reviewed-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/storvsc_drv.c b/drivers/scsi/storvsc_drv.c
index 8ccfc9e..05526b7 100644 (file)
--- 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;
                }