value cannot logically be less than START and greater than BUFFERSIZE.

#define EXTENDED_SENSE_START  18

// vi include/scsi/scsi_cmnd.h +105
#define SCSI_SENSE_BUFFERSIZE 	96
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Willem Riede <osst@riede.org>
Cc: James E.J. Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/scsi/st.c

@@ -2280,7 +2280,7 @@ static int st_set_options(struct scsi_tape *STp, long options)
 	} else if (code == MT_ST_SET_CLN) {
 		value = (options & ~MT_ST_OPTIONS) & 0xff;
 		if (value != 0 &&
-		    value < EXTENDED_SENSE_START && value >= SCSI_SENSE_BUFFERSIZE)
+		    value < EXTENDED_SENSE_START || value >= SCSI_SENSE_BUFFERSIZE)
 			return (-EINVAL);
 		STp->cln_mode = value;
 		STp->cln_sense_mask = (options >> 8) & 0xff;