scsi: virtio_scsi: Add validation for residual bytes from response

This ensures that the residual bytes in response (might come from an
untrusted device) will not exceed the data buffer length.

Link: https://lore.kernel.org/r/[email protected]
Acked-by: Jason Wang <[email protected]>
Signed-off-by: Xie Yongji <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: YongjiXie

drivers/scsi/virtio_scsi.c

@@ -97,7 +97,7 @@ static inline struct Scsi_Host *virtio_scsi_host(struct virtio_device *vdev)
 static void virtscsi_compute_resid(struct scsi_cmnd *sc, u32 resid)
 {
 	if (resid)
-		scsi_set_resid(sc, resid);
+		scsi_set_resid(sc, min(resid, scsi_bufflen(sc)));
 }
 
 /*