[sane-devel] Error on Canon CanoScanLiDE20

[Steven Palm]

On Jun 8, 2005, at 1:30 PM, Gerhard Jaeger wrote:
> On Wednesday 08 June 2005 18:35, Steven Palm wrote:
>
>> scanimage(12019) malloc: *** error for object 0x303fe0: double free
>> scanimage(12019) malloc: *** set a breakpoint in szone_error to debug

>>
>> Is this a known issue, or something unique perhaps to MacOS X ?
>>
>
> In the meantime, it is ;)
> Mattias Ellert already informed me about that issue, although it's
> currently not clear, where it comes from.

  Well, if I change the cleanup code for usbDevs in sane_exit() from:

     for( tmp = usbDevs;  tmp; tmp = usbDevs->next ) {
         free( usbDevs );
         usbDevs = tmp;
     }

  to:

     for( tmp = usbDevs;  tmp; ) {
         tmp = usbDevs->next;
         free( usbDevs );
         usbDevs = tmp;
     }

  It eliminates the double-free malloc error, so the backend runs  
cleanly without the error.

  However, instead of scanning the whole page I get just a small  
corner. I wonder if endian issues are at play here with the image  
size the scanner is told to scan?

  Steve