[SCSI] iscsi: opcode check fix

Must check only valid opcode bits.
Signed-off-by: NMike Christie <michaelc@cs.wisc.edu>
Signed-off-by: NAlex Aizman <itn780@yahoo.com>
Signed-off-by: NDmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>

drivers/scsi/iscsi_tcp.c

@@ -584,7 +584,7 @@ iscsi_hdr_recv(struct iscsi_conn *conn)
 	}
 
 	/* save opcode for later */
-	conn->in.opcode = hdr->opcode;
+	conn->in.opcode = hdr->opcode & ISCSI_OPCODE_MASK;
 
 	/* verify itt (itt encoding: age+cid+itt) */
 	if (hdr->itt != cpu_to_be32(ISCSI_RESERVED_TAG)) {