vdpa_sim_blk: check if sector is 0 for commands other than read or write

VIRTIO spec states: "The sector number indicates the offset
(multiplied by 512) where the read or write is to occur. This field is
unused and set to 0 for commands other than read or write."

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-Id: <20220811083632.77525-2-sgarzare@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

drivers/vdpa/vdpa_sim/vdpa_sim_blk.c

@@ -112,6 +112,15 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 	offset = sector << SECTOR_SHIFT;
 	status = VIRTIO_BLK_S_OK;
 
+	if (type != VIRTIO_BLK_T_IN && type != VIRTIO_BLK_T_OUT &&
+	    sector != 0) {
+		dev_dbg(&vdpasim->vdpa.dev,
+			"sector must be 0 for %u request - sector: 0x%llx\n",
+			type, sector);
+		status = VIRTIO_BLK_S_IOERR;
+		goto err_status;
+	}
+
 	switch (type) {
 	case VIRTIO_BLK_T_IN:
 		if (!vdpasim_blk_check_range(sector, to_push)) {
@@ -178,6 +187,7 @@ static bool vdpasim_blk_handle_req(struct vdpasim *vdpasim,
 		break;
 	}
 
+err_status:
 	/* If some operations fail, we need to skip the remaining bytes
 	 * to put the status in the last byte
 	 */