--- a/sys/dev/disk/trm/trm.c
+++ b/sys/dev/disk/trm/trm.c
@@ -2527,7 +2527,7 @@
 		pSRB->pSRBSGL->length = pSRB->SgSenseTemp.length;
 		pcsio->scsi_status = SCSI_STATUS_CHECK_COND;
 		bcopy(trm_get_sense_buf(pACB, pSRB), &pcsio->sense_data,
-		    pcsio->sense_len);
+		    imin(pcsio->sense_len, sizeof(pcsio->sense_data)));
 		pcsio->ccb_h.status = CAM_SCSI_STATUS_ERROR
 		    | CAM_AUTOSNS_VALID;
 		goto ckc_e;