1 files changed, 2 insertions, 3 deletions

diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index ac63964b7242..dcd9c71fe8d3 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -246,10 +246,10 @@ static int sg_io(struct file *file, request_queue_t *q,
                 switch (hdr->dxfer_direction) {
                 default:
                         return -EINVAL;
-                case SG_DXFER_TO_FROM_DEV:
                 case SG_DXFER_TO_DEV:
                         writing = 1;
                         break;
+                case SG_DXFER_TO_FROM_DEV:
                 case SG_DXFER_FROM_DEV:
                         break;
                 }
@@ -286,9 +286,8 @@ static int sg_io(struct file *file, request_queue_t *q,
          * fill in request structure
          */
         rq->cmd_len = hdr->cmd_len;
+        memset(rq->cmd, 0, BLK_MAX_CDB); /* ATAPI hates garbage after CDB */
         memcpy(rq->cmd, cmd, hdr->cmd_len);
-        if (sizeof(rq->cmd) != hdr->cmd_len)
-                memset(rq->cmd + hdr->cmd_len, 0, sizeof(rq->cmd) - hdr->cmd_len);
 
         memset(sense, 0, sizeof(sense));
         rq->sense = sense;