I have a Mustek BP 1200 CU PLUS scanner A4, that /proc/bus/usb/devices
describe as:
T: Bus=01 Lev=02 Prnt=03 Port=03 Cnt=01 Dev#= 5 Spd=12 MxCh= 0
D: Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs= 1
P: Vendor=055f ProdID=021c Rev= 1.00
S: Product=USB Scanner
C:* #Ifs= 1 Cfg#= 1 Atr=a0 MxPwr=500mA
I: If#= 0 Alt= 0 #EPs= 2 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)
E: Ad=81(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms
E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms
1) I installed cvs version of sane-backend and when I use scanimage the
problem go in Segmentation Fault;
to solve this I have to add a NULL POINTER check on the line 461 of the code
so that:
-------------
case USB_CLASS_PER_INTERFACE:
if (dev->config[0].interface[interface].altsetting)
switch (dev->config[0].interface[interface].altsetting[0].
bInterfaceClass)
{
----------------
This because altsetting something got me a NULL, then altsetting[0] is
dereferencing a null pointer.
2) at line 479 I have todo:
--------------------------
if (!found)
DBG (5,
"sanei_usb_init: device 0x%04x/0x%04x, interface %d
doesn't look like a
"
"scanner (%d/%d)\n", dev->descriptor.idVendor,
dev->descriptor.idProduct, interface,
dev->descriptor.bDeviceClass,
0);
---------------
to quickly drop the altsetting[0] possibility of null pointer.
3) as for 1) in tools/sane-find-scanner.c at line 627
4) at backend/gt68xx_high.c
I have commented out the check for the status, because in this point the
program blocks forever ( for my scanner ). changing status = SANE_STATUS_GOOD
for quickly replacement.
NOTE: I not reported a patch with the point 1..4, but the steps to make a
workaround for those that wants to use sane-backend for mustek bp 1200 cu
plus if they encountry my same problem.
In case case the possibility to have in points from 1 to 3 the
dev->config[0].interface[interface].altsetting to NULL makes clear the
absence of the control for pointer nullity.
kernel : 2.6.14.5 SMP x86_64
libusb ( is used ?) : v. 0.1.10a
lorenzo
