[sane-devel] saned issues for remote scanner access
Henning Meier-Geinitz
henning at meier-geinitz.de
Sun Feb 22 09:48:06 GMT 2004
Hi,
On Sat, Feb 21, 2004 at 11:40:09PM -0000, Jim George wrote:
> The system works well directly and through saned, however it fails when
> accessing saned remotely. I have attached the output of the following
> command to see if this gives anyone any clue to help me?
>
> SANE_DEBUG_SANEI_PAS4S2=255 saned -d128
If you ant to get debug output from the backend, use
SANE_DEBUG_GT68XX. SANE_DEBUG_SANEI_PA4S2 is for Mustek parallel port
scanners.
> [saned] process_request: got request 8
That's SANE_NET_CANCEL.
> [saned] decode_handle: cancel: error while decoding handle argument (h=0, Success)
> Segmentation fault
That's mostly for Julien:
The code in saned looks like this:
h = decode_handle (w, "cancel");
and in decode_handle():
if (w->status || (unsigned) h >= (unsigned) num_handles || !handle[h].inuse)
{
DBG (DBG_ERR,
"decode_handle: %s: error while decoding handle argument "
"(h=%d, %s)\n", op, h, strerror (w->status));
return -1;
}
Now again in the main part of saned:
sane_cancel (handle[h].handle);
That's called with h = -1. Either that causes a segfault or the call
to sane_cancle of the gt68xx backend with some random handle causes
the segfault.
I guess saned should check for -1 here before calling sane_cancel.
I don't understand why the handle was wither not in use or <
num_handles, however.
Bye,
Henning
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