Hi,
On Friday, January 4, 2002, at 03:44 pm, hariharan swaminathan wrote:
> Hi,
> If i remember correct , dwRecvLength should be set by SCardTransmit.
> We are passing a pointer to get the result length. So i don't
> understand why this has to be set.
I think it should be set by the caller as the maximum length of the
response (i.e. the size of the buffer). Otherwise SCardTransmit does not
know how much information it can return.
Not checking this length might cause a buffer overflow...
So I would patch the code with:
dwRecvLength = sizeof(r); // size of response buffer
rv = SCardTransmit( hCard, PROTOCOL, buffer,
dwSendLength, \
&sRecvPci, r, &dwRecvLength ); \
BTW, 256 is too small as the answer could be 256 bytes of Data + 2 bytes
for the SW.
Cheers,
JLuc.
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