iomanX perform lower bounds check on fd before returning

[uyjulian]

No description provided.

[fjtrujy]

I have tested it with my example using ps2_drivers and it works as expected:

ELF changed, active CRC 20E74092 (host:/Users/fjtrujy/Projects/ps2_drivers/samples/filesystem_sample/filesystem_sample.elf)
Applying core settings...
Updating CPU configuration...
EE/iR5900 Recompiler Reset
Warning: GetOsdConfigParam2 Reading extended language/version configs, may be incorrect!
Get Reboot Request From EE

PlayStation 2 ======== Soft reboot

IOP Realtime Kernel Ver.0.9.1
    Copyright 1999 (C) Sony Computer Entertainment Inc. 
Reboot service module.(99/11/10)
cdvd driver module version 0.1.1 (C)SCEI
Load File service.(99/11/05)
Multi Threaded Fileio module.(99/11/15) 
iop heap service (99/11/03)
Poweroff_Handler: Poweroff installed
fileXio: fileXio: fileXio RPC Server v1.00
Copyright (c) 2003 adresd
Block Device Manager (BDM) v1.1
BDM: connecting fs MBR
BDM: connecting fs GPT
BDM: BDM event thread running
BDM FatFs driver (FAT/exFAT) v1.4
BDM: connecting fs fatfs
USB Driver (Version 1.6.0)
usbmass_bd: USB MASS Driver v1.1
cdfs Filedriver vDRIVER_UNIT_VERSION
Re-edited by fjtrujy
Original implementation
by A.Lee (aka Hiryu) & Nicholas Van Veen (aka Sjeep)
CDFS: Initializing 'cdfs' file driver.

DEV9 device driver v1.0 - Copyright (c) 2003 Marcus R. Brown

dev9: CXD9611 detected.
usbmass_bd: connect: devId=1
usbmass_bd: Vendor: IOMEGA  
usbmass_bd: Product: ZIP 100         
usbmass_bd: Revision: E.08
usbmass_bd: 0 524288-byte logical blocks: (0MB / 512MiB)
BDM: connecting device usb0p0 id=0x0
Found MBR disk
BDM: usb0p0 mounted to fatfs
DEV9: Adapter Detection Hack - Resetting RX/TX
dev9: SPEED chip 'ES2', revision 11
dev9: CXD9611 (SSBUS Buffer) driver start.
read/write allocate memory 4000
Opening mass0 via open
Getting driver name via fileXioIoctl2
Driver name is usb
Creating mass0:/testdir
Opening FONTM

Not sure if there are some other issues pending to be fixed, but so far it is working great!

Cheers!